[metroschultz]

Normally you would have broken the bolt free before removing the timing belt.
Allowing you to use the engine compression as a tool to hold it in place while you get the gear bolt free.

Now you will need to hold the cam with a really big screwdriver
Behind the first bearing is a large hole
rotate the cam in the head so you can get a BIG screwdriver into the hole. (I have a number 4 Phillips that is almost perfect fit)
now gently rotate the cam counter clockwise until the driver is near the edge of the head, place a folded rag between the driver and head.
Use a socket and breaker bar (better leverage and less chance of damage to the bolt) to remove the end bolt. (you may need another set of hands to hold everything down on your workbench)
It shouldn't be too awful tight. It only requires 44 ft/lbs of torque when you re-install it. (so breakaway torque may be as high as 80 ft/lbs)

Have fun
Schultz