Been induced 3 times. DS1 was 12 days late, I had pethidine, could still feel the pain of the contractions but the pethidine made me feel drunk so took the edge off. The worst pain was, after 2.5 hours pushing, when his head arrived and I got a 3rd degree tear, he was 10lb 10oz. The MWs congratulated me on how calm I had been throughout. I had to go to theatre and get a spinal anaesthetic to get stitched.
2nd time was abroad in Belgium and the only pain relief offered was an epidural, no gas & air/pethidine etc. They induced me on my due date in case it was another big baby and I didn't argue! Had the epidural, which had a button so I could control the dose, and I could feel what was happening but had no pain. DS2 was 8lb 9oz and born, as the MW called it "starstruck", i.e. back to back.
DS3 was also induced, 5 days late. I had gas & air which seemed to have little effect except give me something to hang on to and I was cursing and swearing like nobody's business. Eventually it was too much and I asked for an epidural but it took half an hour for a doctor to arrive and by then Ds3 had arrived, 9lb 13oz.
My pain was certainly not psychological. I was a thirty something mum with my first and had read every book going and attended all the classes, couldn't have done any more prep to be honest. It's completely different for everybody and you won't know what's going to happen till it does!
I would say, keep an open mind and keep your plans flexible. Luckily for me someone had warned me it could be different if you were induced. What happened with me each time is that once labour started it moved quite quickly and I went from " this feels like not too bad period pain" to "OMG this is excruciating" very quickly. I don't know if the pain is worse because you're induced or if it's because there is no gradual build up so you have no chance to acclimatise.
However, I echo what some others have said, I would rather go through another labour than another pregnancy- nausea till gone 6 months, back problems etc. etc. etc.