He is scheduled for surgery at 9:15 AM tomorrow. He has to be there at 5:15 AM to check in and get all the preparation work. He is expected to be back in his room by noon.
The incision will be small, and the needle smaller. It is about an 18 gauge needle which (according to wikipedia) is about .05 inches diameter or 1/20th of an inch or 1.27 mm. The nurse says they don't expect him to have any ill effects other than recovering from anesthesia. He mentioned wanting to go to a music concert this weekend, and the nurse acted like it wouldn't be a problem at all. It leaves you with the impression that this could almost be an outpatient thing.
He is going to have some limitations on who he can be around for a while. There is some concern that his anti-cancer virus could 'shed' and then become catchable by others with a weakened immune system. It hasn't 'shed' in any of the other patients, and it isn't expected to; but the federal government is concerned, and they oversee the trial.