Wear a dress or skirt, so you that you can use it like a tent to cover yourself.
Bring a friend if you want for support.
Wear comfortable pants or if you own a pair of Leta-lux this will be the moment to wear them.
Listen to music to destruct yourself.
Try to do some breathing exercise to relax.
NHS has more: https://www.nhs.uk/conditions/cervical-screening/