Hi Rook I did the same job last year new brakes & discs all round ,think Nissan were asking £1200 to £1500 for doing it , I've worked on cars & racebikes for years so thought I'd give it a go , but was shocked at how easy it was , from memory once the clippers where off the discs just lift away from the hubs , and while the calliper pistons are pushed out give them a squirt with some brake cleaner spray .
Btw you'll def need a torque wrench for leverage to get them off & setting the bolts to the proper torque setting .
the front is 113-114 ft-lbs
the rear is 53-71 ft-lbs. if you're experienced & have decent tool kit you'll be fine , and remember the brembo calipers if you have them have two bleed nipples per calipers . Good luck ,Paul .