IUD insertion: paraguard

This Thursday I am getting the paraguard IUD inserted. As you can imagine, in slightly nervous haha. I was wondering if anyone could tell me about the insertion process and what happens. Also, I will be in my period for the insertion and I'm confused. They have you strip down for the insertion which is where I'm confused. Am I just going to be sitting in the office bleeding on the table while I wait for insertion or am I suppose to leave my tampon in until the very moment the insertion happens? I know this seems dumb, but I'm kinda nervous about it. Anything advice or insight would be helpful!