Oh god root canal surgery - rather you than me mate *shudder*.
Be prepared to feel unwell for a while afterwards - my ex took to bed for 3 days after he had root canal surgery, with his head under the pillow refusing to move. He looked like he'd been punched in the face, even had a black eye. Apparently it hurt like hell for days after, so make sure you have some good painkillers available.
He said he managed to get through the surgery itself by concentrating hard on his female dentist's breasts LOL