i talked to a few plastics guys with that same question; i can't draw for crap, but i liked the concept and the field seems cool.
he told me that no matter what you do, the point of residency is to beat the procedure into your head so many times that you can do it in your sleep. his words were "if you still think it's cool, you haven't done it enough times, and i don't want you operating on me"
altho a unique perspective, and debatable; he does have a point. 6 years of operating, at least half of those on just doing plastics every day for 1000 days, and you'll be good at it. of course, having an intrinsic ability is what draws most people into the field in the first place
analogy - if i played basketball 100 hrs a week for 5+ years, i'll be pretty darn good; if i grew a few more inches, maybe i'd get into the NBA. i'd never be as good as, say, michael jordon. but the thing is, not everyone can be the best, and somewhere along the way you have to be content with being more than competent. if i had a brain tumor, i'd like the best neurosurgeon in the world to take it out, but so would we all, and if i can't get him, i'll deal with the best of what i got. i guess that's a more philosophical question of accepting the best you have as your resources and working with it. off topic.
in the end, if you love it, go for it. theyll make sure you're trained so you can do it, whether you go in having memorized the entire textbook on plastic surgery, van gogh, picasso (tho i'd be a bit afraid of him), or just a guy/girl who loves changing people's appearances