In my opinion, you shouldn't do anything you're not comfortable doing. Many nurses will tell you that it's not such a big deal, and others will argue the opposite. It depends on your facility and your comfort level. However, don't let your confidence level be the only factor in your decision. Most people when offered something like this, have the ability to do the job, but they are scared to take on the responsibility. It's natural to feel this way. I always recommend actually sitting down and weighing your skills, and compare them to the tasks you will be performing. You will then know if you can actually excel in this position. This will help you overcome any issues with confidence. I wish you the best of luck in whatever you decide to do.