Both mine were induced with the drip. I have quite a high pain tolerance. Worst pain I have ever felt is two ends of a broken bone rubbing against each other.
I felt everything in my back. DC2 was back to back (so to be expected), and we don't know with DC1. Contractions felt really bad period pains. Like a bad muscle cramp (which I guess they technically are), that comes and goes in a long pulse. I found contractions manageable for a while, but needed a bit more than gas+air once I hit 5cm. With my first I had diamorphine, second an epidural.
Main reason for the different choice of pain relief was time in labour up to that point. With my first, it was 6 hours. With my second, 10 hours. Second babies are supposed to come quicker and easier, and I found that that was not the case.
My first, all I wanted to do was lie on my side, and not be touched. When I couldn't face another contraction with just gas+air, as I wasn't keen on having an epidural I chose diamorphine instead. I was sound asleep between contractions, only waking as they neared their peak to suck on some gas+air, then drifting back off to sleep. So bizarre. Anywho, 5 hours later I was fully and was able to push. I had zero urge to push, so it was all conscious pushing. I also don't remember the ring of fire, though I do remember needing to shout at points, so maybe that was it. Pushing stage was only 20 minutes, so it was short lived at least.
Weirdly, despite the length of time, I preferred the second labour. I wanted to move around, and change position for most of it. Was very nice having counter pressure on my back too. However, as the day dragged on, and I got more and more tired, control eventually went out the window, and eventually I broke down crying that I couldn't do it, baby wasn't coming, and I wanted more pain relief. I chose the epidural as there was no guarantee how much longer labour was going to last. As it happens, not much longer, as my previous statement was truer than we realised. Baby was not coming. He was stuck, and his head was not in contact properly with my cervix, hence the slow dilation. After 13 hours of the drip, I was only 5cm, and so had a C-section. The epidural was extremely useful to top up in preparation for surgery.
All in all, yes it's painful