Aiyoh, I haven't done EVC myself but a few of my mum friends who went through it said it really depends lah, some said the pain was manageable, others found it quite intense, especially if the cervix wasn't ready. One of them said the cramping was worse than contractions, but another one said it was over quite fast so not too bad. Best thing is to ask your gynae to explain what to expect and maybe discuss pain management options beforehand, so you go in prepared and not so anxious kan, that also affects how you feel it!