08 Boxster Compression Test

[Vza]

Hi All, Going to do a compression test on my newly acquired 08 Box. Just want to be sure of the procedure:
Eng to operating temp
Pull all coil packs and plugs
Pull Fuel pump fuse
Disable Ignitions Sys(not sure how)
Attach Comp.gauge
Throttle to the floor Crank 5 or so times
Repeat for other cylinders then repeat with squirt of oil in each

Just not sure how or why to disable ignition sys when all the coils are removed anyway. Can I just un plug the DME in the trunk to do this? Did it before can't remember.

Thanks V