There is another aspect of this augument on renovation/repairs and that is you get enormous satisfaction out of doing it yourself. I have seen many people who didn't have a clue even to which end of the hammer to use but have taken the plunge made a few mistakes, made pests of themselves asking questions and finally made a great job of their renovation I agree there are certainly some things that are not worth touching, just be true to yourself as to your ability with a little commonsense mixed in
