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I can assure you that the X5M front brake setup and the rears using the 750i rotors and M5 calipers would be very sufficient to stop the heavy car from illegal speeds and overall a great setup that won't kill the wallet at all if researched properly. Also, it is the most user friendly since they are all bolt on without modifications. The fronts will require a 4mm spacer between the caliper and the mounting point on the spindle while the rears only needed the M5 caliper carriers if you have the 550i since they share the same caliper design.
It would make more sense in your situation to build up your tooling in order to comfortably do the job without fail.
The prebleed was simple. You crack the bleeder screw while the caliper was not installed and allow fluid to pass through while physically rotating the caliper around to release any trapped air. It does sound quite silly and to be honest, I don't know if it mattered vs doing the old school bleed or better yet with the ISTA and power bleeder procedure.
You can find all that info on newtis.info where all the manuals for various BMW are located. You may need someone to refer you to the page since recently they took it down due to legal reasons and "right to work" on our own vehicles.
Believe me, the moment I saw the car drove away from me, I broke down. I'll be honest here since it was one of the most involved cars I ever own and all the mods I did to it to make her last so long. 5 years ownership and put over 60k miles since purchase. The next owner will be happy to see her knowing that the valve seals were done so there is no oil consumption, brand new water pump, pulleys, belts, fresh oil change and such. 90 degree T-stat to keep it running cool and more maintenance items.
But... I have to grow up, get my first home, build a more stability for my finances so I can upgrade myself later in life. I did rent a 2008 Audi R8 for a couple days and the price tag of 75k for a low mileage, 6 spd manual example is quite attractive.
Hope it all goes well, treat her right and she will most likely will give back lol.
I said mostly because N63 and the TUs are still unpredictable. Just the nature of the beast.
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