I done mine in order to get it wrapped mate. I know what you mean it is on there tight and your probably thinking why the hell you started to remove it now!!
I got a hair dryer (my Mrs' not mine), heated up one end for a bit then quick movements with fishing line.
You will only get as far as the bolts on either side which I believe is about 4" in on both sides.
At that point the fishing line will keep snapping as its rubbing on the bolt.
All I did was heat up right next to the bolt until I could almost peel up the spoiler ever so slightly (not too much as it could snap). Then manoeuvre the fishing line to the opposite side of the bolt and continuing with the 1st process of heating etc.
Once the majority is unstuck, you just pull upwards and firmly around the middle of the spoiler and it will unclip the two poppers in the middle of it. So 2x bolts (1 at each end) and 2 clips in the middle that just pop out with a pull.
Once done you will be left (maybe, I was) with sticky residue where the spoiler once was. This stuff is nails to get off it took me a total of 4 hours. Peel and scrape as much as you can off then use some kind of residue remover of some sort (I used one by autoglym, worked a treat).
I also had quite a few stuff marks on the boot from the fishing line (where I got a bit too carried away).
Can't find any pictures from when I took mine off but hope this helped. If not then that's about 10-15 mins of my life I'll never get back lol!
That's what she 'Zed' :-/