Ive had two Mirenas.
The first one I had was put in by a GP who had never done it before, which in a way worked to in my favour because she was so cautious and gentle and explained everything. I won’t lie, it wasn’t comfortable but nor was it painful. The measuring aspect is to find out the distance from the top of the cervix to the top of the womb so they know how far to insert the coil. The whole process took about 20 minutes but I think that’s because of how cautious the novice GP was being.
The second one I had put in was done by a far more experienced GP and she’d obviously become numb to how uncomfortable the procedure can be as she had no bedside manner and no awareness of my nervousness or consideration that it might hurt and she just shoved it up me as casually as you’d chuck your trainers in the cupboard after taking them off when you got home. It took about two minutes and it did hurt, to the point where I had tears in my eyes. However, I want to stress that the pain was due to her personal technique (i.r not giving a shit), as opposed to the procedure itself.
I’m having another one put in next week and I will make it very clear that I do not want that GP doing it again.
If you explain how nervous you are, and ask them to take it slowly I’m sure you will be fine OP. As others have said, it’s not comfortable (like most things that women have to go through) but it is manageable and with taking painkillers before and after it’s not anything that causes any long lasting discomfort.
I had a bit of tummy ache for a few hours afterwards with both insertions but it wasn’t anything that stopped me carrying out my normal daily duties and I was back at work the next day absolutely fine.
Even with the unpleasant experience of having my second one put in (again, only because of how crap the GP was) the 30 seconds of pain was still worth it.
Being nervous is nothing to he embarrassed about though so even if you do end up cancelling, that’s ok. But honestly, it won’t be as bad as you think it will be if you have got an understanding and sympathetic practitioner doing it.