^ I made that mistake. You see new discs need to be used gently otherwise you can warp them. HOWEVER, new pads need to be done like you said, by doing a few 30 - 0 stops and then 60 - 30 stops. Or a combination.
So that's what I did, and when I pulled back in my drive the discs were smoking (obviously I had taken the surface off them) but luckily they aren't damaged. Phew!
So perhaps the best bet is to take it easy for say 50 - 100 miles and then do the harsh braking to bed the pads in properly?!