It's more about personality than talent. You can "will your way" into just learning the basic technical things you have to know, assuming that you’ve been given the Good Housekeeping Seal of Approval first (i.e., you have graduated from a top school). If you are smart enough to be "at a level," a good accounting teacher can train your brain to do the ministerial tasks. That works for the lower levels of investment banking—i.e., being an analyst or associate. But as you get more senior, the gig is all about selling—can you get clients to PAY you for your bank's work? If you can, well, er um, by definition then…you're…qualified.