Before you give up I highly recommend viewing B-Dubs excellent thread about his base gasket replacement . It covers everything related to tearing down the top end and putting things back together. The videos are very informative and confidence building. I was like you before viewing..."No way" I said. Then I viewed B-dub's post and videos and came away thinking "I can do that!". B-dub patiently explains all the tools and techniques which makes a rebuild feasible.
Even if you do not do the work yourself you will come way understanding your bike much better after reviewing the following link.
Beginners Guide to Base Gasket Replacement