I would say if you do small tutorials on a semi daily basis and do ongoing projects in 3d that you’ll be pretty damn good after a year or so… I still come on here with tons of questions but i’ve been using 3d on and off for over 15 years… i started with 3d studio release 4 back in the 90s and once i was 16 and could drive a car i quit doing 3d and started partying, I did some 3d in college in 3dsmax, then i didn’t do any for several years again, then this job i have requires some so i started doing it again in cinema4d…
I would say out of all the programs i’ve used (maya and 3dsmax) cinema4d is the most user friendly and easy to learn…. but that doesn’t meant it’s any less powerful… it seems to be reaching the level of all the other programs fairly quickly, but i don’t even have the version 12 or 13 yet… i’m in 11.5 … the good thing is, once you learn one 3d program, they are all very similar… the interface is just different.