I'M IN THE SAME PLACE BUDDY!
New to me boat..."what the hell is all this?"..."wasn't really planning on this being a project boat"..."I'd like to kick the PO right between the legs"...etc.
Having had other boats (and having forgotten this state of mind) I can suggest just like the others have...find some small projects that will guarantee success and tackle those. That will get your confidence up AND give you the added benefit of getting into the boat and having time to process what you see. That breeds familiarity, which breeds confidence.
Good luck! Hang in there!