2 people and 3 screwdrivers get the circlip off easy. one bloke uses his 2 screw drivers at the end of the clip flexing it and as soon as you see the clip coming up and theres a gap between the clip and it's hole that it sits in, the second person sticks his screwdriver in the hole therefore stopping it from falling back in, then you just manipulate the screwdrivers to get the clip off.

I hope I made sense


cheers
Damo