I'd be thinking the same even if it were some other bike I was working on Wapping. I'm not the handiest person when it comes to DIY and mechanics!
The GS itself I've no doubts about whatsoever. In the short time I've owned it I just know it's the right bike for me. Only wish my handyman skills were a bit better!
As I said in another thread, at least you are having a go....
Good luck with your endevours
As a compromise why not buy a very cheap old bike and see if you can do it up?
Two good tips I learned from my father who was an aircraft engineer, working on aircraft brakes, tyres and suspension systems.
1. Buy a few very good tools, rather than a trunk of junk. The sticky thread in the 1200 section shows all the basic the tools you will ever need day-to-day.
There is also a link to an excellent home made DVD from an American bod, showing excatly how to do many of the basic tasks. It's not cheap cheap but not bad value, either.
2. Never to take too many pieces apart. If they can stay joined to the bike, while you work on something else so much the better.
Look at pictures of GP bikes being worked at in pit garages. Short of a full rebuild, they leave most it intact as much as possible. You can see much of the same process in play in many of the excellent pictures of DIY and 'How to do it' projects here on UKGSer.