Find paper manuals and read them .
They have warnings which almost never get communicated in the advice from any online forum. They also include the situations where multiple styles of parts were put on different cars and how to make sure you are all matched up.
I think both the Haynes ( for better pictures ) and the MB FSM are required on most jobs.
Haynes leaves out a lot of stuff that is clearly important... that info can be filled in by the FSM.. which has a lot of gaps in communicating procedures... assumes you can read their minds....