It kind of depends on the engine and installation. Some engines like a couple of turns choked with a couple of flips before you hook up the glow plug. You have to learn what combination works best for your engine.

As posted in the other thread, as long as the engine is open port, it will not do anything while you are grasping the prop. Hold it firmly and pull though compression and feel the bump. If it is over primed it will bump every time assuming it has a good hot plug. When it bumps every other time, it is perfect for starting. If it doesn't bump at all, it is either very flooded, completely dry, or the plug is not glowing.

Also it works best if you adjust the prop so that it is level when you are against the compression in the direction the engine runs. This makes it easy to flip and saves props should you dead stick.