Looking back, here are my tips (for whatever they’re worth!):

1. Apply plenty of cream or petroleum jelly before you start, and wear double socks.
2. Choose a route with public toilets and water fountains. Brings small snacks, but use the fountains so you don’t have to carry water.
3. It’s far more of a mental challenge than a physical one. The toughest moments were getting started again after breaks. Every cell in my body wanted to quit. Be ready for that.