I started out as a ride operator.
The way they started workers out first on non-mechanical rides (slides, bounce house), then mechanical kids rides, then adult rides.
After the first 2 weeks I started out helping with break-down. Initially easy stuff like wrapping cords, hanging fences on the disassembled rides, trash pickup. Then helping with mechanical disassembly. It's often a matter of just jumping in to do what needs to be done (once you know what to do).
You'll find that what takes 2 days to put up only takes about 4 hours to break down.
I'm willing to answer any questions I can.