For me, the LP was not the big deal that I thought it would be. The actual procedure is uncomfortable, but not terribly painful. I layed still for around two hours I think after the procedure, and I did get a headache, but it wasn't the horrible headache from hell that I thought it would be. I had a lingering mild headache and soreness at the puncture site for about a day, then I was fine. Overall, the whole experience wasn't nearly as bad as I thought it would be.