I don't have a problem working on my own cars or bikes, but there comes a point of cost vs what I get out of doing it myself. Example, a heater hose broke in a former car once and the location of the hose made the car company to build a special tool to get to the nut to remove the hose, the tool was only sold by Snap-On and cost $180, a radiator shop did the job including the hose for $75, so it was more cost effective to have it done outside rather then me buying the tool then spending an hour fixing it using a tool that I would only ever use once since no other car on the market required it. I always weigh out the cost to buy tools and how many times will I use the tools to do other jobs. In the case of wheel building I simply don't have enough wheelsets built to justify the price of getting the tools even though I have a dozen or so bikes.