to be honest going into this trade they dont expect you to know much, they know you passed your test/interview and some tool knowledge. You go in and just follow directions. If you don’t know ask. Youre pretty much just a grunt for the first year just whatever they ask you to do. I got lucky and have experience and know our material ( i used to make our product) but now installing them. Just show up at least half an hour early everday and be prepared you will be fine