How to remove the front brake rotor of toyota tacoma 97

Hi,

I have trouble with removing the front rotor of my toyota tacoma 1997 v6 2WD extra cab.

In most cars, the rotor can be slided off the 5 bolts that holds the wheel hub.

In the tacoma 97, there are 4 bolts that mount the rotor to some part of the vehicle. When I tried to loosen these 4 bolts, the whole rotor turns and I am not sure now I can lock the rotor so I can loosen them bolts.

Also, what's the best way of loosen the bolts so I can remove them?

thanks a bunch,

BZ