Pick a Route Your Body Can Already Almost Do

Your first long distance walk should be a stretch, not a gamble. The trick is to choose a route you can genuinely imagine finishing on a good day, then let the challenge come from doing it day after day rather than from a single brutal stage. Somewhere between 60 and 110 miles is a sensible first target: long enough to feel like a proper journey, short enough that a lost half-day does not wreck the plan.

Look at total ascent as well as mileage. Forty miles across the flat Fens is a different animal from forty miles in the Lake District, where the same distance might carry three times the climbing. Gentle first routes include the Dales Way, the Cotswold Way and the South Downs Way, which rolls but rarely bites. The West Highland Way is a wonderful introduction if you are reasonably fit, though the climb over the Devil's Staircase and the descent into Kinlochleven will remind you that Scotland does not do flat. Hadrian's Wall Path is another good starter, with plenty of villages and a genuinely spectacular middle section.

Be honest about your base fitness. If your longest recent walk is two hours on a Sunday, do not book a week of 25 km days.

Split the Route Into Days You Could Repeat

The single most common mistake is planning one heroic day and six ordinary ones. Plan every day as something you could repeat seven times over. For most walkers new to multi-day trips, that means roughly 12 to 20 km with up to 500 m of ascent, or about four to six hours of walking once you allow for stops.

A useful rough guide for estimating time is Naismith's rule: allow one hour for every 5 km, plus one hour for every 600 m of climbing, then add time for rests, photographs and getting slightly lost. It is not perfect, but it is far better than assuming a 20 km day takes four hours because you once walked 5 km in an hour on the pavement.

• Finish where beds exist. Plan stages around villages, pubs with rooms or campsites rather than around round numbers on a map.
• Keep a short day in reserve. A 10 km day in the middle gives you a buffer for blisters, weather or sheer tiredness.
• Identify escape points. Note every road crossing, bus stop and station along the route so you can bail out without drama if something goes wrong.
• Front-load gently. Do not make day one your longest. You will be carrying a full pack and working out your rhythm.

Book Transport Before Anything Else

Transport is the part people leave until last, and it is the part most likely to scupper a trip. Work out your start and finish points first, then book trains, coaches or a taxi to connect them. Advance rail tickets in the UK are dramatically cheaper, but they tie you to a specific service — risky if you are relying on finishing a 20 km day by a particular time.

Many rural stations on long distance routes have infrequent services, and Sunday timetables can be almost nonexistent. Check the last bus as carefully as the first. For remote start or finish points, local taxi firms will often meet you at a trailhead if you ring ahead a week or two in advance; turning up and hoping for a cab rarely works. One popular approach is to leave the car at the finish, take a taxi to the start, and walk back to it. Another is to book a baggage transfer service, which moves your main bag between overnight stops so you carry only a day pack.

Plan Resupply and Somewhere to Sleep

Accommodation on the popular routes fills up months ahead, particularly at weekends between May and September. Book the whole chain of nights before you commit to a start date, and confirm each one in writing. If you are camping, check whether the site takes bookings, whether it has a shop, and whether it closes out of season.

Resupply is more fragile than it looks. Village shops close early, some shut for a half-day midweek, and rural Sundays can be a desert. Carry at least one spare meal and a day of snacks beyond what you think you need. Water is usually easy to find — village taps, pubs, cafés and churchyards — but on high moorland you may go three or four hours between refills, so start each day with a litre and a half and top up whenever you can. Keep some cash; honesty boxes, small cafés and campsite fridges do not always take cards.

Prepare for Fatigue, Weather and Blisters

Day three or four is where first-timers tend to hit the wall. The excitement has worn off, the legs are heavy, and the pack feels heavier than it did on day one. Plan those days shorter, eat properly the night before, and accept that a slow start is normal.

Look after your feet from the first hour. Stop and treat hot spots immediately, before they become blisters. Two pairs of thin socks, or a liner and a walking sock, reduce friction, and airing your feet at lunchtime works wonders. Keep your boots dry and your toe nails short.

British weather deserves genuine respect. A warm, wet summer day on exposed moorland can chill you faster than a cold, dry one, so carry a waterproof jacket and trousers, a spare warm layer, gloves and a hat even in July. Pack your spare clothes in a dry bag. In Scotland, midges from May to September can ruin an evening at a campsite, so a head net and repellent are worth their weight. Check sunset times, carry a headtorch, and always leave your route and expected finish time with someone at home.

The Last Week Before You Go

In the final week, check the long-range forecast and adjust stages if needed. Confirm every booking. Weigh your pack, then take out the things you have not used since your last training walk. Have your maps ready — a 1:50,000 set for the whole route, plus 1:25,000 for the trickier sections — and know your first two days' navigation well enough that you are not squinting at a map in the rain.

Walk in the boots you plan to wear, test your stove, sort your food into daily bags, and arrange who is holding your spare keys. Then all that remains is to get up early, put one foot in front of the other, and let the miles take care of themselves.