I'm not saying one thing or another, but what tools do you need for a head gasket? Will normal hand tools and a torque wrench do the job? Seems to be getting a Clymer's or Chilton's book with the tools shouldn't set you back too much. I'll bet there are videos on You Tube doing a head gasket on the same engine.
The thing that always gets me is time. These jobs always take longer than you figure and you've got to "run for parts." If you've only got the one vehicle this can be bad. On the other hand, if you live in a place like California, you can use a bike year round so you can get parts. You also won't end up working in a snow bank at -20 F. If doing it yourself makes you lose time from work, it may not be worth it.
Sometimes, it is worth the time to get parts from a junk yard, recondition if necessary, pull your parts off and just replace. I can't see that working for a gasket.
If you are like me, it gives me a big smile to have saved money doing stuff myself. It's a little like beating the system and giving it to the MAN.