For me it’s headlights! I’d rather do a complete brake job, swap out a Speedo gear, a Dizzy…. Whatever. But getting those 2-pc headlights on their respective guides, locator holes, trying to get the damn adjustment tool to actually DO something etc etc is the most dreaded thing I’ve done on my car. Frickin’ hate it more than anything else that I am capable of doing myself. Granted, the list of things that I CAN do myself is next to nothing compared to the rest of you, but I thought it would be interesting to hear what fixes everyone else truly HATE!