Step 1: Tools and Materials
torque t25 screwdriver
torque wrench (optional) needs to go to 40-60in lbs
Step 2: Take Off Tire
Step 3: Change Disks
Once the disk is off place the new one in place and first hand tighten all screws in the same pattern. Then if you have a torque wrench correctly set it to 40-60in lbs. To set the wrench start by un doing the wrench completely and then screwing the handle up to somewhere between 40-60 in lbs (not ft lbs). If you don't have a torque wrench (or it can't go to 60 in lbs) do your best to tighten all the screws evenly. Once all the screws are done up the wheel can be placed back on the fork and the quick release can be tightened. Then take the bike for a test run and make sure the brakes are working, trust me finding out at the top of the hill is much worse.
Sorry about the super wide angle pictures.