I was surprised at how easy it was to pick up. Theres still a lot of things I don't know but the documentation online is excellent as well as the unity forums where pretty much any problems you have have already been asked. My A-level physics has actually come in handy
Yeah the documentation is very thorough and it's unlikely that you've got a problem that no one else has had (and solved) before.
If only they used video game development problems as examples when teaching math & physics at school, I'm sure much more people would be attentive in class!
Worth picking it up now so you've got the pro licence that allows exporting to other platforms.
I've been using Unity since about April or so and am only now starting to make original content as opposed to making clones. Hope it's coming on well!