clearance lights/fantastic fan grounding

the mechanic that came and clean installed my wiring from the fuse box back told me it needed to be shrink wrapped if its on the outside of the vapor barrier, which it is. no I'm not a mechanic or an electrician, the information I go by is what I'm told by the professionals that come to do work for me. I rely on that, sorry if I don't automatically jump on the first answer when I'm given several solutions at once from multiple sources. on top of that, I've been working on this 12-14 hours/day for almost 3 months and am entirely exhausted. I've had to reverse SO MUCH work that people did wrong, or I did wrong because I listened to the first thing someone told me.