Hi @Hansoo
I am afraid I do not know much about vaginismus apart from the very basics, and that is is muscle related. I'll tell you what my experience was like, and I hope it helps you a bit. I think the dilators are a great idea, I hope you get on with them and they help x
The clinic I use does not do sedation, you are given Entonox (gas and air) and they do 4 local injections into your cervix and then start the procedure. I had the surgeon, nurse and embryologist down by my feet, and a nurse at my head who monitored my blood pressure (which was sky high), and who talked to me about anything and everything to try and keep my mind off of what was happening.
I had never had gas and air until my egg collection in March. To start with, I didn't feel like it was doing much. I was told to use as much as I liked and that I'd naturally stop when my body had enough on board.
I was terrified, I use it a lot. I didn't feel any different but right at the end I felt like I had a higher voice, although could have been my imagination. The injections into the cervix do hurt, but it is over quickly. I didn't have any pain after the local jabs during the procedure itself, or after in fact. No cramps, which I was fully expecting.
It is out of your system in 20 minutes I think, after the last breath of it so you can drive if needed etc. Personally I felt fine after. I have read that it can make some people feel sick, but luckily that was not the case for me.
The transfer is like having a smear test, and a lot less scary than the collection although I don't think you will find that any easier I am afraid due to the vaginismus. I can tell you it doesn't hurt and is over pretty quickly.
Feel free to ask any questions you may have, happy to answer anything if it may help you.