1) You will need to cut your tunnel protectors. If you plan on running spikes, you will need to add something new over the heat exchanger after.
2) Dremel works well for enlarging the holes.
3) Raise the back end so the crossover bar is ABOVE the reservoir tank, a little will come out, but not enough to worry about.
4) Before you bleed do NOT let it down to the ground, let it down far enough that the reservoir is the highest point on the cooling system, open the vent, and pour in your 60/40 mix of GREEN. You may need to add pressure to the reservoir to get it to flow in a hurry, or figure some way to suck it out the vent. Gravity works, but is not fast enough for the impatient.