All good advice - I'll add my comments as if I hadn't read other replies.
Buoyancy is something you'll get used to over time so I won't bother with that subject: it's covered in your training.
Equalizing:
Have you ever been on a plane? Or been on a mountain road and come down into the valley in the car?
Did you feel the pressure on your ears?
If so: how did you correct it? Swallow? Pinch your nose and gently blow?
That's all you have to do when scuba diving with one important difference: do it more often.
The reason you have to do it more often is because pressure changes more frequently in depth of water than in depth of air because water's heavier. So every metre / 3 feet you should be pinching-and-gently-blowing / swallowing. If you leave it too long then the pressure of the air that you're breathing may be a little too high and actually, counter-intuitively, be forcing the little tubes in the back of your throat (the eustachian tube Eustachian tube - Wikipedia, the free encyclopedia) shut. Solution: don't let the pressure build up too much before equalizing, and the way to achieve this is to equalize often during decent. Initial dives are likely to be down a reference line for you to hold on to, or down a sloping bottom (e.g. a shore) so the depth increases gently whilst you get your buoyancy improved.
This all assumes that you have no congestion. There's no harm in having a quick check with a dive doctor - he'll use one of those devices to look in your ear and ask you to swallow to observe the eardrum moving as the eustachian tube is pressurised from the swallowing.
Buoyancy is something you'll get used to over time so I won't bother with that subject: it's covered in your training.
Equalizing:
Have you ever been on a plane? Or been on a mountain road and come down into the valley in the car?
Did you feel the pressure on your ears?
If so: how did you correct it? Swallow? Pinch your nose and gently blow?
That's all you have to do when scuba diving with one important difference: do it more often.
The reason you have to do it more often is because pressure changes more frequently in depth of water than in depth of air because water's heavier. So every metre / 3 feet you should be pinching-and-gently-blowing / swallowing. If you leave it too long then the pressure of the air that you're breathing may be a little too high and actually, counter-intuitively, be forcing the little tubes in the back of your throat (the eustachian tube Eustachian tube - Wikipedia, the free encyclopedia) shut. Solution: don't let the pressure build up too much before equalizing, and the way to achieve this is to equalize often during decent. Initial dives are likely to be down a reference line for you to hold on to, or down a sloping bottom (e.g. a shore) so the depth increases gently whilst you get your buoyancy improved.
This all assumes that you have no congestion. There's no harm in having a quick check with a dive doctor - he'll use one of those devices to look in your ear and ask you to swallow to observe the eardrum moving as the eustachian tube is pressurised from the swallowing.