Hello Tom, I will explain how I do if it is useful for you, :
-1. To equalize or doing the click sound try to push your tongue back and down, it should open your e-tubes to the max, at least it does to me. This movement at the same time closes the the airway that goes from the mouth to the nose, so you can not maintain it the whole descend because it would not be possible sending air to your mask, sinuses and ears. You can do as many times as you need while you descend to clear your ears, much better if you do just before the 1 m, to avoid the built up of negative pressure. This method is very gentle, so is not necessary to push the tongue very strongly, you will do it without realizing.
-2. To check if your e-tubes open try to make the same movement as described before (push your tongue back and down), but very gentle, in a way that is possible at the same time blowing air through your nose, you should hear the air passing through your ears. This movement should be enough to equalize under water, but since the pressure is very strong, sometimes it would be necessary to apply more pressure with your tongue to open more the e-tubes, as described in the point 1.
-3. When performing the equalization try to maintain the head straight, not turned to the left or to the right, since this movements can close the e-tubes.
-4. Also is useful to sniff, or to swallow since this movements can help to remove some mucus that could obstruct the e-tubes. So when you prepare to go down you can perform some swallowing, and if you notice that you have an obstruction try to sniff.
Good luck!