You'll love it. It will change your life in an amazing way.
Tips? Nothing concrete. Be open. Everything will change; let it. What you thought is true and indisputable will be called into question; let it. Find new truths. Bruce Lee said, "Be water." Be water. Allow it to change you and it will, permanently, in the best way possible.
When I was 26, I moved from California to Europe and never looked back. Easily one of the best decisions of my life. Have fun. You won't regret it.
Oh and when they ask you, "Who do you support?" (and they will!) it means which football (soccer) team do you back, and the answer is Liverpool.
P.S. If you have any concrete questions, my email is in my profile.
Interesting that you moved from California but do not comment about the London sun at all, though to be fair, you said you yourself moved to Europe and not the UK.
A friend from SoCal who moved to London for a few years couldn't really handle sky getting dark around 3-4 in the afternoon in the winter, and she would say it was almost impossible for her not to get depressed during those times. So just something to be prepared for.
On the bright side though, London, as with many German cities, has short cheap direct flights to many sun bleached cities and beach destinations in Europe so I would suggest making ample use of them if you can. Being in the US afterwards, one realizes there is no location in the mainland US that can compete with the Mediterranean with respect to actually being an inviting body of water to swim in (non mainland Hawaii is obviously an exception).
And May and June in London itself I often find especially beautiful as well.
> it means which football (soccer) team do you back, and the answer is Liverpool.
This is the way.
I never understood and would like to know more on why people from London or other areas that are not Liverpool and have no connections to Liverpool whatsoever cheer for Liverpool team. I'm kind of local patriot and always cheer for my local club.
Because with Liverpool you will never walk alone ;)
Um, I am from Liverpool. I grew up on Springbank Rd, L4, about spitting distance from Anfield.
[dead]