Heart surgery, not so much. Rebuild car engine? Done it once on a VW Bug, once on a Honda Civic. My Tech Director - Nate, you know? He's going to be doing it this weekendish, I believe, as his Beetle has taken a little nap.
Of course, he also was one of the founding Gentoo kernel guys, so... er. Well, I don't _know_ if he's done any heart surgery, but he's worked with NASA on some rocket engines.
Some guys _are_ just that damn good. Doctor Tyche is one of them.