I have to say you have some good answers here. I have seen horrendous workers with no ehtics or professionalism. It is not a job to be taken lightly and I fear that the best tool is extensive training and education. I think that with the experience and training one is more likely to be able to maintain professional conduct. I hope you find what you are looking for but I guess I would say the price of a job such as this is very high. I would not take it lightly.