Well, I can do it, and I am basically a trained monkey.
http://forums.pelicanparts.com/showthread.php?t=379187&highlight=assembling+901%2F05
Albeit an OCD one.
The difference between amateurs and professionals is:
1) Professionals do it FAST, as their livelihood depends on it; and
2) Professionals do it right the first time, as they have BTDT.
As an amateur you must reconcile yourself to:
1) Making a huge investment in special tools, in the thousands of dollars, to do it right;
2) Working slowly and triple-checking all your work to be sure you aren't going wrong; and
3) Not being afraid to go back to the beginning if, for example, the crank doesn't turn freely, or the cams bind, etc.
It's a heck of a lot of fun and you have thousands of viewers of the Pelican ERF here to guide and cheer you on.
I say, DO IT!