Tiling - something I can do well but I absolutely hate doing. I also hate letting someone else do it for me because they inevitably do it differently to how I would have - things like centring on the wall vertically and horizontally, treatment at external corners and so on. I've done a couple of bathrooms and a dining room floor (floor is much easier). I made the mistake of putting in a mosaic frieze in one bathroom - that was a nightmare to both install and grout. However, having sworn and cursed and thrown some things around, it is immensely satisfying to step back after that final polishing wipe and see the end result.
I have a bench rotary tile cutter, nibblers, a scorer, a tile 'hacksaw' and a 'snap'-type tile cutter - between them I can get all the cuts and shapes I need. I started out using a combined adhesive and grout but have graduated to individual versions of each which works much better.