My wife has trouble, in Cozumel this year I finally convinced her "early and often" means as soon as you head is wet and all the way down. She almost never has problems when changing depths once descended, only with initial descent. Descent went much better this year.
Many moons ago when I was a young guppy I managed to barotrauma both my ears diving off Ft. Lauderdale. After I recovered enough to dive again, my diving physician stressed that people should actually start equalizing their ears BEFORE they get in the water.
Basically, during equalization you are flexing your eustacean tubes. When you do this earlier & keep doing it all along, you are making them more flexible and the whole process much easier. I have tried to teach this to my students as well; it works.

Bonne chance,