I worked for Nationwide crash repair centers before i started working for myself and they dont come much bigger than that. I was a panel beater for Nationwide but learnt how to paint and prep at college whilst on my apprentiship. I have to say as a panel beater its not boaring at all because the job varies from repairing scratches, dents etc to replacing compleate panels, including welding brazing spotwelding etc. also loved the larger repairs such as jig work pulling chassis legs and allsorts so it was never boaring. but as a painter in a large shop all you do is prep mask and paint imo and to me that is boaring. however it is best if you can do both parts of the trade for yourself because then you can pick which part of the job you want to do and then change if you do get board of it. It also helps if you are just starting up your own buisness because you dont have to employ anyone else to help you untill you are big enough too. that way go can gain your rep on your own high standards not the person who is working with you.
cheers kyle