I have had 2 emcs, one under general, so a bit different, but here goes.
You should not feel any pain but you will feel movement, for example. It is a strange feeling but NOT painful. Spinal anaesthetics are not perfect, but as you are having an elective the anaesthetist will be able to take his or her time and get it right. They'll spend lots of time spraying cold stuff on you right up to your boobs and asking you if you feel anything before they start.
Once you are anaesthetised they'll prep you for surgery, so you'll be catheterised, be given a wee shave if you need one, they'll stick monitors on your chest and your tummy will be painted with that iodine stuff. They had a screen up when they did this to me, although tbh I couldn't see over my bump anyway!
The anaesthetist will be by your head the whole time and can talk to you about what's happening. If you feel sick at all or uncomfortable tell the anaesthetist and they'll sort it.
The baby will be out quickly - within a few minutes of the op starting. They may offer to lower the screen so you can see the baby born. Don't worry - the incision/blood etc will be on the bottom of your bump. You will just see your baby being held up.
The sewing up takes some time and can feel strange. They will, for example, rinse out your uterus and it can feel like someone is washing up in your tummy. This might make you queasy but it won't last long. The baby is usually off getting checked over for a bit but then they wrap them up and give them to you/your partner.
You may be encouraged to start skin-to-skin contact and if not you can ask the MW to help you hold the baby on your chest.
And that's it. I appreciate it must be an odd feeling, walking to theatre to have your baby etc, but you so won't care once he or she is here.
Good luck, I am sure it will be lovely.