It's not bad at all, you'll be in and out before you know it! They'll sedate you and you'll lay on the operating table on your stomach. They should have a local anesthetic in so that you really can't feel much and will likely guide it in with a fluoroscopy, which is an x-ray. The rest of that day and the next day your back might be a little sore, but you shouldn't have to follow any restrictions starting the following day. Good luck!!