You will need a 14mm(??) 12 point torx bit and breaker/large ratchet to undo the carriers on the rears, disc doesnt come off without the carrier removed! I tried, no amount of hammering budged it!
Caliper rewind tool is essential as said, pretty easy to do, if your anyway practical an hour will do it, if not comfortable with something like this, get someone experienced to take you through it, essential part of maintenance to get right!