I know how you feel, I just a brand new 2008 CK20 HST and I already have 22 hours on it. I have tons of projects.
And beleive it or not, the first real dig I made, I had a ouppps.. I just cut a wire but it was an old one that is not in use anymore, so I was lucky.
so BE AWARE of the wires and know were they are before digging....