Hey Oswaldo, My father is a mechanic so I asked him this question so I could answer your question on here. He said that he wish he knew when he was first starting out that the only person who you know can do the job 100% how it should be done is you. He learned the hard way with co-workers who did sloppy work and bosses who were careless so he quit and began his own mechanic shop. He now is self employed running his own business with no employees. I don't know if this is helpful or not not but.