As you say if it was the bearing making the noise you would know about it I think, if, with your hands on the wheel at half twelve and then quarter to three, you dont feel any knocking then it can only be one thing.
You need a multispline male socket to undo the inner cv joint to flange bolts and you can buy these as a kit from many places, get a good quality set of them if you can as they are always handy.
I would remove the shaft from the car and dismantle it, if theres loads of grease in the boot and the joint then its shot, if it appears dry when dismantled then someone may have re-fitted it without enough grease in it.
Depends who is doing the work to be honest. if its a garage them to replace it with a new one for piece of mind.