I agree with everyone else, but there are obstacles you may not be thinking of...
Tim Hortons - That's right, everytime I go to work on my car I have to go get a coffee, consuming a good half hour of my time and my money!
Envious neighbours - That's right, everytime I go to work on my car, the neighbour comes along and wants to talk and gawk!
Cheap Tools - I have a lot of them, they break, don't work right...I should just buy less and buy quality.