i had a spinal tap a few years ago. If you prepare for it like Dahlek says and stay hydrated and then make sure you lay down for the rest of the day afterwards to avoid the headache you can get if you dont lay down its not that big of a deal. Its not painful at all while they are doing it. Dont let them rush you out of the office after it is done. You should be able to lay down for as long as you need to, up to an hour. I laid down in the car on the way home also. Its really nothing to worry about.

many times when i drive for a long period of time or sit for a long time, i hobble around for a while after i get up. I get very stiff from sitting. I think that is pretty common for certain types of PN.