manuals or display and placement information

Good, how about everyone? ... I am new in the forum, and the truth is that a partner of my work of this spoke to me. I am repairing the things that my car has my car little by little a mercedes e300 (W210). Access, that's why I ask you, in case that step is also necessary or not, and if it were a yes, then know about that too.
I can help you in something reference to this model, in case you need you already know where to look for me .. Greetings, I hope an answer soon.