even professionals f**k up. my friend had his clutch replaced by a certain well known performance shop in sydney, they negelcted to change some seals and the clutch was stuffed again a week later...
sumo my point is, anyone can turn a spanner, undo a few bolts and figure out how to put something back in and tighten it all back up. infact anyone with half a brain and the service manual could do it....it is however in certain cases, just like the above, that we should be aware of our own *limited* capabilities...
just one more point, im a software developer but i can build a PC from scratch, but when i first switch the thing on after rebuilding, i always have my heart in my throat in fear that it doesn't work ...