It will depend on your degree choice, your university, and your A Levels.
A Levels are difficult. They are a massive step up from GCSE, but help massively when it comes to university. The struggle is worth it if you go to HE because it'll prepare you.
Degrees are not easy at all though. If you did the subject at A-level, you may find it somewhat easier than some other people if the content is repeated, but there is much more independent study and more expectations for you to work hard.
However, you should choose a degree in something you feel passionate about - this makes it easier than if you HATE the subject at university, just in that the subjects you dislike at A Level are harder.
I am going into my second year of university, and I don't think my first year was easier. There was more freedom, less contact hours, and more opportunities to do social things, but the academics was by no means simple. Assignments are challenging, library books can sometimes be illegible, and some lecturers are completely awful. I had a lot of mental health issues too, which made coping with university much more difficult. But with a bit of perseverance, you can do it.