Induction is different for everyone.
It's not necessarily going to be more painful but it does increase your risk of various things like instrumental birth, Caesarean section, fetal distress, 3rd/4th degree tears. Some people find it okay others hate it. Some are quick and some are long.
Just because your cervix is 2-3cm dilated does not mean going straight to break your waters is the right thing to do. The pessary favours your cervix for labour. If you cervix is long, posterior and hard still then a pessary would be the way forward. Breaking waters too early can lead to more intervention, more need for hormone drip. Also one persons 2-3cm is someone else's 1cm.
Normal process can be pessary in for 24hours, reassess after 24hrs if. It favourable, break for 12hours and then go for another pessary. Some units use gel some use a different pessary which works over 6hours. Some people go into labour with the pessary but that is not the aim of it. The aim is to favour your cervix, so making it soft, thin, bring it from posterior to central/anterior.
I had an induction. Pessary went in and within 30mins I was having back ache. By 2hrs contracting well. Waters broke naturally after 14hours of,contractions, pessary came out on its own. Contracted on my own for another 9hours until I had hormone drip started as I was no longer progressing with my irregular contractions. Then delivered at 9cm another 12hours later by Caesarean section.
I would say that was a quick induction. Like I said, some are uber quick, sometimes pessaries don't work and inductions fail. Although if your cervix is open you should at least be able to get into labour.
Important things, eat, drink, mobilise, pass urine regularly. Do squats, avoid lying on your back as baby will become poorly positioned.
Don't worry about baby's size. National guidelines now are not to induce early or do c sections for large babies. My boy was 10lb 5 and estimated on scans to be large...not why he was born by c section though
Also expect to not get asked to come in straight away for induction. Units do get busy and they will only invite you in and induce you when it is safe to do so