I've had mine out, and I asked to be put under. I'm not watching someone rip something from my mouth! I'm not going to lie it was scary, I've never been under before. I did start to panic, but I'm a moron and looked at the tools. I remember the nurses trying to calm me down. Also I'm a diabetic so they had to stick an IV in me to make sure my blood sugars were stable. Next thing I know someones lifting out of a chair, the room is moving and my dad walks in. He got a good laugh helping me eat some yogurt. You have to THINK about eating, so you don't nom your tongue to death. But it's not bad, they give you (from what I hear) great pain killers if your sore afterwords.
But you should be fine, it is scary, but think of it this way. You get a decent nap and yummie food after ^-^