It turned out I had a slight scoliosis, so they took somewhere around three quarters of an hour to get the injection in so it was having any effect. For a few weeks afterwards my mum and dh were marvelling at all the attempts they'd made - the base of my spine was bruised to hell with lots of different pricks.
Each time they put one in, I got a really bad pain all the way through my back. One of the attempts gave me a sudden crazy shock, so my foot exploded with a hot pain and went completely buzzy.
All of this made me really panic, until I was just shaking all over. I was convinced that a) I would end up paralysed for ever and b) they'd have to go straight to general anaesthetic - I've had a lot of GAs in my life, and the more you have, the more scary they seem. I was also worried that I wouldn't know when it was working and would tell them it was and really it wasn't. I was just a quivering mess.
Once someone had worked out I had a spine curvature, they got a colleague in to try. He got it in, I instantly started to feel numb. I felt absolutely 100% confident about the way they were ascertaining the lack of feeling. They were really lovely people, talking to me, relaxing, making me laugh, and the questions they asked me about numbness were exhaustive and used lots of techniques. I felt great, I relaxed, and I had a really lovely peaceful c-section.
So, the start was grim grim grim, but then it was a peach of a procedure.
I told them why I'd been so scared and shaking afterwards (I mean, while they were doing the incision etc) and they said it would have been impossible to paralyse me putting the needle in there, and I should have mentioned it earlier and they'd have been able to tell me that categorically. I think they really know what they're doing, really take care, and it isn't anything to be frightened of, HOWEVER, it is VERY easy to get frightened. I was also very very dehydrated and starving, having not eaten for about 24 hours and only drunk a thimble of water and dry-heaved the last of my morning sickness all morning long. I wasn't in the most rational/non shaky physical condition.