I f*ck things up all the time, it is just that as opposed to the do-it your-self guy I get paid for it. I do hire work out on my boat but mostly I am too fussy or cheap let someone else do it. Particularly cruising it is a huge plus to have a clue of your own systems. I learn sometimes from others but mostly from screwing up less the longer I try. Taking my head apart at the dock in Victoria one summer was a rich memory, me and my sewage are on countless Asian Tourist Photos.