Man u sound stressed. Juat follow the simple multistep proccess for all plane travel and you will be good.
Get to arport many many hours ahead of shedule
Checkin yourself and ur bagged in
Spend 93hours getting through security
Find ur boarding gate look at it and assess how many hours untill u board
Set an alarm that gives u ample time to get from wherever in airport to ur gate
Find food and drink
U have now set urself up so u almost cant fuck up relax dude as long u get on ur plane ur fine.
Btw window seats are bullshit the actuall seat u want is the isle seat. Dont worry about engine noise its the same everywhere most of the sound comes through the plane body. Front back middle doesnt really matter just want to try avoid being near a bathroom cos that will keep u awake all friggin night.