Not really, I was lucky enough to have mentor who literally just let me screw around with them. I had hundreds of real hours programming random stuff on both,

Not really, I was lucky enough to have mentor who literally just let me screw around with them. I had hundreds of real hours programming random stuff on both, as well as fixing real world problems with the safety of someone double checking. So I was very comfortable and I mostly used reference manuals for quick look-ups. These systems are VERY different that what you are most likely used too, so having face time with them is really important.