The bottom pulley bolt is a *mad*ing tight, I think you'd struggle if the engine's out.
It is..Tried locking the flywheel with a screwdriver..still could not remove it..
So put a socket and wrench on the pulley bolt,placed a piece of wood on the chassis,placed the wrench on the wood ,disconnected the spark leads and turned the engine over.. TAKE CARE IF YOU DO IT THIS WAY AND MAKE SURE THE WOOD IS IN THE CORRECT POSITION...It was the only way I could do it.
Everything else was easy
Steve