If I were going to do it I would wire the frame before putting it in the hive. As always, with foundationless, make sure the hive is level so the comb will go down the middle of the frame.
All that's necessary to extract is:
Make sure the wax is mature, not soft like putty, but at least a couple of weeks old so it has a bit of substance to it.
Make sure it's attached at least a little on all four sides.
Make sure you are gentle at first when the combs are full. Start slow and work your way up.