I am a bit like 7.62marksman and while I may not know how to do everything, when the chips are down I will usually have a go and find an answer. I have a few saying that I "live by" and one of them is "I will have a go at anything, BUT don't ask me to do open heart surgery". It is a joke really, but never the less, if someone else can do, then usually you can.
Oh, while I am on my sayings list, another one is an answer to people who ask about retirement. I have always liked most of the work that I have undertaken in my life, but the difference between before and after retirement is that "now I can do the things that I want to do, not the things that someone else wants me to do". Oh, it helps to not be married of course.
Rob P.