Easiest way i found was to remove sump and old gasket, clean as much oil as you can from gasket face on the block. Put a small ammount of silicone around the groves in the oil pump and the rear main seal carrier. Offer up the gasket and hold it in position with a few bolts, press the gasket into place around the oil pump and rear main carrier. Allow the silicone to dry then remove the bolts.

The gasket should now be stuck in position, refit the sump and use the above torque settings/sequence.