Yes plane is packed as only Flexi fares remain....however many that is ?
Everyone on the plane in economy is generally in the same boat all heading to the same destination so I'm no different to them.
I have an aisle seat down in like row 80 or thereabouts, I can stretch my legs and if they allow maybe walk up the back steps every hour or so.
Maybe a slim chance we have a spare seat besides us as 2 of us booked aisle then window and left middle seat vacant, not much chance if the flight is full.
So trying to condition myself, because at this point for me its too late to back out, not technically but self esteem wise.
Still could be 1/4 of the plane unsold, depending how far away the flight is and if they think people are still going to buy the tickets at the higher price.
Also not sure if i missed it but havent seen you mention how old you are? not a massive concern, but you mention getting up walking stairs and around every hour. DVT reasons or just to streach the legs?
I know I sit at home watching tv or even at the cinemas for 3 hours ect at a time, so dont sit there clock watching thinking ok on the hour every hour im getting up for a walk, this will make the flight seem so much longer. But by all means walk around when you do feel the need rather then the clock. But try not to relentlassly pace back and forward the whole cabin if its at night, stick to the bulkhead and toilet area if possible. Also the sitting in your back seat of the car would seem a lot worse than being on the plane. because your sitting there for no good reason on a plane is for a reason so easier to accept the situation. The long haul planes are bigger than the short haul, so will already be more roomie then what you have probably been on before, if you dont have an issue on trains and busses then it would be similar, just one happens to be in the air.
Internaltional generally have a slight bit more room on there seats then domestic aswell, and if your not overly tall you can streach your legs out right under the seat infront, I can straighten my legs and im 6ft.
Dont get to hung up on seat selection, I would much rather sit basically anywhere with friends in the same row then a middle seat in an exit row or the likes. 1. for more entertainment and 2. you dont have to avoid eachothers personal space as much, can kick your leg under their seat ect for a min to streach out and the likes.
If you sit there and think about it you will make it a lot worse for yourself. try to relax, close your eyes and 'rest' if its a night flight and cant sleep (I never sleep on the way but 90% of the time can on the way back). Just relax as much as possible enjoy a drink or 2, watch some movies and tv shows (either your own or in flight stuff) and have a chat and joke with your mates.