Ok, I've got the door panel off and I have no idea what I'm looking for. This will be the first DIY project with my car, if it's too difficult I will probably take it to the shop , but please let me know what you guys think and how difficult the task at hand is. Pictures are always a plus

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1986 560 SEC *Sold* < Big Mistake I miss my baby!
1988 300SE *Sold*
1989 300CE - current car, but not for too long