A trick question. If you're an Emergency Medicine specialist, there should be nothing that's done in the ER that you're uncomfortable with. The list runs the gamut from simple blood draw to emergency thoracotomy. This somewhat relates to the previous sample answer in that we all have good days and bad days--that is, a day in which you accomplish an invasive procedure without difficulty will contrast with another day in which you can't. At that point, you should let someone else try--but on the front end, you're the one trained to try first.