I’ve been using it since R08, self taught plus the original course. OP I’d say it depends on what you want to use it for and how often you’ll use it, as others have said getting the hang of it is easy but there’s a lot going on in the software and mastering it on your own is time consuming, if you have someone to help you out that’s great but YouTube is great for help if you don’t have support in the office. If you’re familiar with shortcuts in Cad you can make life easier by setting up the same command shortcuts (view tab-User Interface-keyboard shortcuts) and also see what’s already set & there’s a lot of overlap.
The OOTB families are rubbish, download what you need from somewhere like national bim library, plus they have the advantage of having COBie data attached if that’s your bag. Building Revit families is a whole other skill.
Don’t give up, it’s daunting when you first start but it’s been around for a long time, the additional Internet manufacturer support means it’s getting better faster, and it is the future. A month should see you tottering, 2 months walking, 6 months running, but you need to use it daily if you can.