You can't actually see the bolts without a mirror. There's a cover plate on the passenger side of the bell housing (near the rear side of the oil cooler), it's just inboard from the "barring" hole. With the inspection cover off the transmission you can use a bar or screwdriver to turn the engine while feeling for the bolts in the access hole. I make a line up mark on the flex plate, torque convertor and bell housing so it's easier to locate the holes when you go to put back in...
Good Luck