Well im at unsw so feel free to ask me anything specific down the track. I know we have a program that looks after exchange students and will buddy you up with local students and we offer housing.
Does your university have a exchange program with these uni's or are you comming in via some outside program?
As far as subjects go just look on the websites and they should have course cataloges. here is unsw (it may vary each year though)
http://www.timetable.unsw.edu.au/200...ectSearch.html
the school of psychology site would be more specific again.
I hope someone is able to help you with the UK uni's. Its really tough just going on what websites say. Good luck!