Thanks for the help, though I got my dad to do it.
Finally got it off and a new Thermaltake Volcano 7+ running smoothly.
Spent nearly an hour with a flathead screwdriver and we found a nut driver lying around, and used that as well.
Just to anyone upgrading an HSF combo: The stock AMD HSF's are a big pain to remove. If you do it incorrectly, you can damage the motherboard (static damage from screwdriver) or crack the CPU die if an unequal amount of pressure is applied between the retention clip, HSF or the CPU itself.