Is it possible to learn Latin alone?

Hi, new to Reddit, so I have no idea what I'm doing. I just wanted to ask if it were possible to teach myself Latin (or Greek, but I'd like to do Latin more).

I'd like to know if, firstly, this is realistic, and if so what sort of proficiency is expected in about one or two years. I study French and I'd say I'm all right at that, if that's any help to answering my question (not fluent by any means though, haha).

Additionally, I'd like to do Classics in the future, and either do Greek or Latin. I have no prior experience in Classics, Greek or Latin, but I don't expect it'll be terribly difficult? Perhaps I'm wrong. Anyway, just wanted to ask and see what I can achieve.

Thanks!