>>2436732That's an ambitious hike but nothing amazing was ever done without ambition and a bit of lunacy.
Walking wise it shouldn't be too troublesome, if you don't mind walking on main roads you should find pretty straightforward routes, but having trucks, buses and cars speeding by you isn't fun, the noise isn't fun and the smell isn't fun either so if you want your journey to be at least a bit comfortable you'll want to choose lesser traveled roads, which will mean more time and distance, perhaps leading to places with not many infrastructure to buy supplies.
Although sleeping shouldn't be a big problem most of the way since you can throw a bivvy or tent pretty much everywhere you have to remember you'll be crossing major metro areas where you can walk 50km and see nothing but concrete jungle and crushing there might be unpleasant or straight up dangerous depending on the location.
Your gear should be very optimized for your journey and it will be long enough for seasons to change so your gear has to change too, September in Gibraltar is easy days, January in Latvia might mean death if unprepared (which at that point in your journey you would already be more than prepared).
You can go lightweight or go heavy and carry a cart with you for your stuff. It's up to you to decide.
Language will not be a problem all across western EU, upon entering the east it might be a bit more challenging but nothing jewgle translator can't fix.
Then you have your health and fitness, legs will get stronger as you go but feet will suffer walking all day on hard surfaces, if your nutrition isn't on point you might consider using supplements and vitamins to keep your engine working well. Doing a blood panel and fixing that annoying tooth before starting isn't a bad idea.
The rest of technicalities you can ask anons specifically or look around the web.
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