NA vs EU/Finding a Guild

I don’t think you should worry too much about finding a guild. 40 man raids mean guilds will likely cycle through more members than in retail, especially early on when a lot of people might decide classic raiding isn’t for them. So getting a try in a raiding guild will likely be pretty straightforward I’d imagine.
Personally I wouldn’t put a strain on my real life responsibilities to try and accommodate a raiding schedule that really just doesn’t align with my life.
I’ve done it before and it only leads to burn out eventually, either in game or in RL.
As for leaving your friends behind.. well that’s a pity, but you will make new ones, which is awesome!