CLUNK, its already done in a sort of way. In (animal) research anyway a lot of the operations are done by technicians rather than vets or doctors and they are VERY good at it. When I did my first microsurgery course years ago we were taught by the techs, who thought nothing of joining up 1mm blood vessels and could do it consistently and successfully time after time.
The problem of course (just as in aviation) is not so much being able to do things as knowing WHEN to do them (and when NOT to do them). And of course, knowing what your options are when you find that you can't (for some reason) do the expected. In other words, knowing how to salvage the situation when things go pear-shaped.
I guess in a way the sim is like working in the animal lab - sure you can do it fine, but we all know just how different it is when one (or a few hundred) person's lives depend on those few seconds that you have to get it right.
"What would you do in that situation Colonel Yeager?"
"Well son, I wouldn't BE in that situation....."