LOL dont cut anything you crazy mofos!
the last two clips (should be 3 holes in the boot, the centre ones are the big clip) are easy to remove. Get a mate to help (sounds like you have them ) and get a flat head screw driver.
Get the screw drivers head against one side of the clip, lever the screw driver so it pushes the side of the clip in and slowly lift the spoiler. This will cause the one side of the clip holding the spoiler in place to remain pushed against the hole in the boot, and therefore not clipping! Then be very careful, hold it in that position and place the screw driver on the other side of the clip. Lever, lift and hey presto the clip is out. repeat for the other side obviously. If your not careful when holding the spoiler with half the clip out, it will slip down and clip back in, making you start again.
Any more questions or explaining please ask, but dont cut anything is all i can say. Thats ridiculous.