M.R.
We had a really good experience with our daughter, I know that they use several different procedures, our doctor said that he shaved hers, which is the least painful, and had he known she had as many nodes or something, he would have used something else, so it may depend on the technique the doctor uses.
She did great, was up and eating a PB&J by noon (I think her sister ate most of the popcycles!) Some kids do really well, and some not, so you should be ready for a wide range of possiblities. I hope your child has it as easy as mine did, but I would be sure to leave the hospital with pain meds and not ever let her pain get out of control. When I have had surgery, I know that the key is to keep ahead of the pain.
M.