Removing nuts on the pulley to access water pump

[deadflo]

I need to replace a leaking water pump. I also took the radiator out for better access and to get it re-cored at this time.
I havent yet gotten to the pump, hope the bolts there are easy to remove, but right now Im just trying to loosen the nuts that hold the fan and fan clutch to the pulley.You can see the nuts in the accompanying pic.
The problem is the pulley rotates while I'm trying to get some traction on those nuts and it will just spin. I put the fan belt back , thinking that might slow it down a bit, but it really doesn't. Andy suggestions how to keep the pulley from rotating, or am I doing this wrong?

[Zed Head]

If you remove the belt then just put one loop over the pulley that you're working on, you can squeeze the two sides of the belt tight with one hand and work the wrench with the other.  Or, you might be able to just push on the belt with one hand to tighten things up while working the wrench.  The first method works well though.  Same principle as those rubber belt (strap) oil filter wrenches.  You could use one of those too if you have one.

http://www.harborfreight.com/2-pc-rubber-strap-wrench-set-69373.html

[deadflo]

Zehead you rock, I tried that and it worked great! Got the fan and pulley off. Tried the first 10MM bolts on the pump with that same wrench, and they seem to be coming off OK! They were very lightly torqued luckily. I haven tried the bigger bolts on the pump yet. I doid spray PB blaster on the bolts 2 days ago.

[deadflo]

OK, well I got the pump off no problem too.