Nickel, my lovely, if you are induced then it could all be over quite quickly and you'll be cuddling a lovely warm little bundle before you know it.
My rather over-engineered birth plan went out of the window quite quickly, and if I were in the same situation again I'd just stick to the basics, which were: mobile/upright for as long as possible; allow a tear rather than do an episiotomy; do everything possible to avoid forceps/ventouse unless the baby was in danger etc; breastfeeding.
You'll find that the HCPs will explain your options to you as you are going along, and between contractions I was very capable of listening/asking questions/debating and made very reasonable decisions. And the decisions were much more informed than when I'd prepared my birth plan because all of the uncertainties were crystallising.
So I knew how DS was coping (because of the monitoring), I knew how quickly I was progressing, I knew how much pain I was in and roughly how much longer it was going to last etc etc. I also had access to HCPs so that when I finally decided to have an epidural, I had a chance first to speak to the anaesthetist about what was involved, the risks etc. It's actually much easier to make these decisions when you aren't in a vacuum.
You're obviously very intelligent and capable, with an intelligent and capable DH and if it comes to a medicalised birth then you'll judge perfectly well what is best for you and ISBN even in the thick of things.
In terms of "things" to have with me, I only ever wanted/needed:
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my DH 
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food (including a cheese sandwich proper savoury food rather than little snacks/energy drinks which failed to keep me going when I was knackered)
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my ipod, earphones, speaker dock and remote control - in the early stages and post epidural when I wasn't in much pain, I quite liked being able to choose my own music. I ignored the carefully prepared playlist because I wanted something different - less stimulating - from what I had expected. I also used the earphones overnight during the early contractions because they blocked out other hospital noise.
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I listened to some audiobooks and watched videos on my ipod overnight. I was contracting gently, DH was catching up on some kip, and I needed something a bit more distracting than music but equally couldn't be arsed with a book.