I started an engine reconditioning apprenticeship and left it very quickly.
I guess youve got to decide if its really what you want to do...because 3 years on a shit house wage doing the shithouse tasks is a high price in reality.
If you do end up deciding you want to do it, make sure you get a good employer. The big "group training australia" and "biga" or whatever they are sound like a good way to go but you'd really have to research it more.