When I walked about 1/3 of the Pembs coastal path last year, I did quite a lot of training. I was planning to walk about 10 miles a day on average and do the lot, but on about day 6 I pulled a calf muscle and stopped.
Things I would do differently:-
1. Be 3 stones lighter (I am, pretty much).
2. Don't be frightened of using public transport, if it exists, to get you from and back to your stopping point each night, if your B & B is not actually on the route. There was one very cheap pub/accommodation spot in Pembs that was within a 10 mile bus ride of over 40 miles of the coastal path.
I was very pleased with my kit. I used a lightweight Osprey rucksack, quick-dry shirts & underpants, Berghaus fleeces etc. My walking boots were very good Altbergs that I bought specially. A good hat to keep the ultraviolet of the pate is also essential.
As it happened, my pulled muscle, which was a niggle rather than serious, was just about painful enough that I was worried it would get worse, and I have previous with a major calf muscle tear. It proved to be a blessing in disguise as once I got home, the really hot spell of late June weather started, through which walking all day would have been taxing to the point of being dangerous. Jan and I went back to Pembrokeshire and spent a week on the beach.
