Agree with everyone that buoyancy control is the critical skill.
But... You can do something about your air consumption rate. It's actually very simple, just concentrate on doing longer and slower exhales. Maybe count to 5 (and eventually 10) when exhaling. Eventually it will become second nature and you won't have to concentrate on it except maybe at the very beginning of the dive.
Doing so will slow down your overall breathing rate. Not only does this conserve air, it helps keep you calm and ensures CO2 is efficiently cleared. Elevated CO2 is a real villain in diving, it causes headaches and anxiety, and is a major contributor to panic.
BTW, don't worry about trying to slow the inhale. Modern regulator second stages (and modern for regulators goes back at least 30 years) deliver air quite forcefully once airflow commences making it difficult to "sip" air. Even if you can, it's not a good idea in terms of blood CO2 levels.
I should include some caveats here. Sometimes you need to adjust your breathing to better position yourself in the water or because your exertion level is high and that should take precedence.
But... You can do something about your air consumption rate. It's actually very simple, just concentrate on doing longer and slower exhales. Maybe count to 5 (and eventually 10) when exhaling. Eventually it will become second nature and you won't have to concentrate on it except maybe at the very beginning of the dive.
Doing so will slow down your overall breathing rate. Not only does this conserve air, it helps keep you calm and ensures CO2 is efficiently cleared. Elevated CO2 is a real villain in diving, it causes headaches and anxiety, and is a major contributor to panic.
BTW, don't worry about trying to slow the inhale. Modern regulator second stages (and modern for regulators goes back at least 30 years) deliver air quite forcefully once airflow commences making it difficult to "sip" air. Even if you can, it's not a good idea in terms of blood CO2 levels.
I should include some caveats here. Sometimes you need to adjust your breathing to better position yourself in the water or because your exertion level is high and that should take precedence.