I never bother undoing the hub nut! It's easyer to pop out the lower ball joint and track rod joint. That will give enough room to pop out the shaft from the Cv joint to do the boot. I saw a colleague undo the upper arms on a civic with the same result but not used that way myself. The exhaust bolts are 10mm and should as already stated snap off so new bolts can be used. Stainless is the best bet there