Prep for psychology degree rips??Watch this thread
P.s I have no direct psychology background
Assignments generally include a stats exam (not working out or doing maths, but usually interpreting results or answering questions to show your knowledge); lab reports, where you carry out your own data collection and analysis (could be an experiment or surveys); some places do weekly assignments; and research participation (where you get to complete tasks for other students/researchers, including surveys, memory tasks, puzzles, perceptual tasks, eating studies, etc)
For your final question "is it hard", I'd say no. So long as you do the reading and exercises, and ask if you do get stuck on anything, then there's no reason why you wouldn't pass.