There's several things you could do, some starting now, that will make clearing your ears a "non-event" come dive time. I suffered many ear issues as a new diver, and had to learn several techniques to overcome them.
As said earlier, start to practice clearing now. Not only will you get conditioned to this, but you'll learn a whole lot about how to do it easiest.
Next, do your first clear just before your head drops below the water. It's strange, but this really makes a difference.
Don't clench the regulator with your teeth - it isn't going anywhere. Tightened neck muscles can restrict your ability to clear.
During the dive, especially early on, "blow" your nose. Press a finger on ONE side only, and blow out anything in there. Then repeat on the other side. I find this particulary helpful on cold dives, since the temp seems to cause my sinuses to act up.
NOTE: When you're doing the clearing, it is always safer to not squeeze the nose completely shut. If you do you may rupture the round window. By leaving a "safety valve" you can let excess pressure escape. Besides, if you had to blow that hard, you probably needed to ascend first anyway.
And if these and all of the tricks you learn during the class don't do it, you may have to call a dive. I've done it many times over the years. Better to hold off and dive tomorrow than to dive today for the last time.
Hope this helps,
Steve
PADI Course Director