If you decide to strip it down and fix it, it really isn't that hard.
The problem is most likely crap in the tank (don't ask how often you need to do that!)
1. remove the pipe from the carb and drain all of the petrol from the tank
2. unscrew the petcock from the tank taking care to have a bowl to catch the last 1/2 pt when you unscrew it.
3. Put the petcock on the bench and disassemble it. Watch out for the spring that will make a bid for freedom.
clean out any crud and check the operation.
Reassemble - you might want to use a little p.t.f.e. plumber's tape on the thread of the petcock into the tank.
Easy maintenance that will let you learn as you go. The worst thing that can happen is that you arse it up and have to buy a new one.
Or you set fire to your bike!
REgards
TT