Crank nut / flywheel removal

[Lowfield]

Hi
Wanting to strip an ajl engine for complete refurb.
I have the longblock sitting on the floor.
I assume the crank nut needs removing first followed by hex flywheel bolts.
Is there a flywheel locking tool available to buy or is it a carefully positioned screwdriver on the fly (2 man) ?
Sump and oil still present and would really like to strip this myself to save on costs.
Thanks in advance
Simon

 

[aragorn]

the factory tool for the crank sprocket looks something like this:

http://i15.tinypic.com/3y2bb4o.jpg

or this:

Amazon product

I improvised by welding a long steel tube to a spare crank pulley