I thought you were a mechanic?
Jack up car.
Remove rims
Remove calipers, put on steering rack or something, just dont stretch or crimp your brake lines.
With a Landcruiser, not sure about skyline, there are a few bolts to undo, something like 5 or so 14mm, then open up the part connecting the rotor, to the part where the bots are, f**k i cant think of what its called. and then yeah.
Fair sure thats what you do...
Disclaimer: use this at own risk, i take no responsibility for what you do. Seek professional mechanics help if unsure, or google.