Hello,
I did AS Psychology with last year. To be honest, I didn't enjoy it as much as I thought I would. Most of my friends loved it, so don't let me put you off! I found there was a lot of content and research to learn. I didn't mind learning some of it, but it felt like all I was doing throughout the entire year was learning about research. We also had a bit of troubles with teachers throughout the year, which wasn't great. I say go for it as I found most people do enjoy it, I didn't mind the subject itself and some of the content was interesting to learn.
Hope this sort of helped!