Easy enough apart from the disc retaining screws that are made of cheese..
bleed nipples are always a worry and they are only brass.......i always wire brush round them first to get rid of any cr*p that may increase friction then give them a squirt of WD40 30mins before i try to undo them.....so far no issues (touch wood).
You dont need to touch the bleed nipple when doing disks and pads.