Hi.
Only undo one screw..............just loosen the other screw. Then you can just swing the clamp out of the way.
To install, pick up the screw with your magnetic screwdriver, and manipulate with your fingers so that the blade sits in the screw slot. It should stay there.
With your other hand, swing the clamp around into position and hold it down. You can now insert the screw into the hole and tighten it up.
Rgds.