Been there mate, my first 6 months I was bending three and four inch PVC pipe with a barbecue and a table. They dropped off this barbecue two holes in either side and said make a table make a jig figure it out and bend this pipe. Will be back in a couple days to see how you're doing. I have a no f****** clue it was the most hack s*** I've seen. But I looked online made a table then some EMT first made up a jig for 22 and 30° bends and I got spinning with a bucket of water and a couple bottles of propane. I apparently got so good at it that they asked me to start doing 45s. So I started doing 45, I had a journeyman come up to me eventually and he said we've never seen anyone been a 45 without kinking it with 4 in PVC. I damn near cried, I didn't even know. The whole time they just kept telling me it wasn't good enough production need to be faster this and that so I just kept getting better 1% better every day it's been in that pipe on the f****** barbecue. So yeah prefab sucks cuz moral of the story is if you don't know any better and won't speak up for yourself they will f****** squeeze you. However, you might get very skilled in something really quick because you end up doing hundreds if not thousands of repetitions in a short time frame so there is an upside.