brakes

You'll need a lug wrench to break the wheel lugs loose, a jack (hydraulic is best), one-two jack stands, something to place behind the rear wheels, a socket/ratchet set (mm), a large enough C-Clamp to fit over the calipers to depress the piston. Don't forget to loosen the master cylinder cap before depressing the piston, as fluid will rise.

do you what mm wrench will have to borrow

The wrench isn't mm.. This refers to the sockets. It's probably 10mm, but I'm not sure. It won't be larger than 13mm.

Do you know what size metric wrench I will need? (I will have to borrow it)

thank you very much