I'll add a bit from my experience - there's lots more to my birth story, but these are the bits relevant to induction.
I was induced at 39 weeks, unplanned, due to leaking hindwaters - basically a hole in the sac but above the baby, so my waters didn't 'go' as gravity wasn't helping. This is a significant infection risk, so there was no waiting around after the gel didn't get things going - baby had to be delivered ASAP.
Gel was given at about 11pm, I was moved to the delivery suite at 3am, waters were broken and hormone drip was started.
I absolutely could not easily move from the bed. I had the drip, monitoring wires for me, monitoring wires for the baby - I was basically confined there. I constantly felt like I needed the loo with the pressure of the contractions starting, but getting there was a massive palaver. I couldn't go without a midwife to help me up without dislodging anything, and to untwist everything after. I absolutely had not planned for this. I note pps saying they could move around easily, and wireless monitoring is now common - I am so pleased to hear this. But do give some thought to your coping strategy if that is not the case. I hadn't, all my plans involved being active, and then I couldn't and I was suddenly terrified.
I have only experienced an induced labour, but my feeling is that contractions with the drip were very different to contractions as they had been described to me before. There was no 'building up', no time to prepare myself - I either wasn't contracting, or it was suddenly there, full force. This could just be me and how my body works, or my misunderstanding of what to expect, or that's just how the drip works. Again, I wasn't prepared for this.
The way I was contracting meant that gas and air did nothing for me - with no build up to the contraction, by the time I reacted, breathed it in and the effect kicked in, the contraction was finishing it, so I got the effect afterwards, when it just made me feel ill. I didn't want pethidine (personal choice), and was very happy to have an epidural. It worked well and just made everything better - didn't constantly need the loo, contractions were manageable, actually managed to rest (I'd been awake for 48 hours by that point). I won't be having another baby, but if I had done, I would have had an epidural in my birth plan right from the start.
It took about 9 hours from the point that the drip went in to when I was fully dilated and ready to push. This was much, much faster than anyone expected, and took the midwife by surprise. If you do have an epidural, then be aware that you need to listen very carefully to the midwives on when to push, as you otherwise won't (necessarily) know.
However - I want to stress that despite everything I've said above, my daughter's birth was a very positive experience. The midwives were wonderful throughout, and I felt very safe, supported, listened to, and well cared for at all times.