one hit wonders

I guess you can tell I am having a bad week.....but my question is, how do you become one of those nurses or techs who do the same cases and work with the same docs week in and week out? and on the off chance they need to do something else, they do all but jump up and down saying "i dont do that, etc etc" while others, get bounced around from service to service, surgeon to surgeon and expect to function.....is it seniority? experience, what? i always say if I could just do one service for just 2 weeks, now that I have some experience under my belt and I know what I need to be asking, I swear I would be an expert at it!!! its just hard doing something every 8 weeks and then struggling. then the people who regularly do those cases either complain, or worse, they actually sabotage the case to make it look like the cases shouldnt go on without them....its sad, imo...... input?