Hi Scarlett,
Do you have problems equalizing while descending on an airplane? If not, what are you doing to clear your ears on the plane? Some people swallow, move their jaws around, Valsalva (pinch and blow)... you can try to duplicate that when diving.
The DAN article that
@Barnaby'sDad linked is a great summary of equalizing techniques. I've found the Frenzel maneuver to be extremely effective myself. It was originally used by German dive bomber pilots in WWII. The "K" sound is more of a gutteral Germanic "G" sound.
Best regards,
DDM