I'm been a tradesman since 1970 and I admire people who will have a go themselves as its not cheap anymore to get in a professional. There are however a minority of people who do not forsee any danger in anything, and everything they touch turns to ****. I have seen some DIYers who have done a more thorough job than some tradesman would and ive also seen some tradesman do some appalling and dangerous things. Its all a matter of common sense and the ability to know if you are capable or not to carry out the task. Then again theres that minority who are totaly convinced they can do the job, but can't.