not too hard mate, pull your spark plugs out, unplug CAS (loom attached to the thing on the front cover of the engine) and injectors (injectors are the grey plugs on the intake side on the front of the motor) make sure the compression tester is de-compressed, screw into the spark plug hole as much as you can by hand (dont over-kill).
sit in the drivers seat, put your foot to the floor, wait for 5 rotations of the motor and stop.
then go check compression. write it down and note which cylinder
then repeat.
report back.