Well, the way I look at it is that you're paying someone to do a job for you, and it's not unreasonable to ask him/her to do the job the way you want it done. Some people don't deal well with that, but others respond quite well.
In my own personal experience, as a nurse, if someone wants me to do something differently than normal, I'd much rather they tell me. If it's not something I'm able to do, it gives me a chance to talk with them about that, and hopefully sort that out. But if it's something I can do, that's out of the ordinary, I'd be sad not to be asked, as there'd be virtually no way I could figure out what they want if they don't say.
Baby Fine 3B, low porosity, normal density and elasticity
CGing since July 2008