Good luck. Hardest part if all the timing but really not hard at all. You should not feel the catheter at all and no pain. The only thing you may feel later is that when you O, you might feel it much stronger than ever before. That is do to the trigger.
Good Luck i had my first IUI 9 days ago and i didn't even feel her do it, your cervix will already be slightly open due to the ovulation so i think that helps a little. The only uncomfortable part was the speculum but it feels just like a normal pap. It was over before I even knew she began.
I did feel ovulation happen the night of the trigger (i had it the Saturday morning before) and that was a little painful.
