Hickdive is spot on about starting the lift neutrally buoyant. The Instructor Manual reminds instructors NOT to teach the dumping of air, because of the problems it causes.Sorry HickDive. We refer to it as that as it's literally in open water.
The dumping of my air was a recommendation from another instructor, not mine but something I tried.
Tonight (in the pool, from 3.5m) I successfully did 3 CBL's. Typical! First was with two casualties, then with two casualties without a mask (the best I've done ever apparently!) and a third (with a mask) lifting 3 casualties.
...but I struggled with ONE in the open water!
I had a chat tonight with my instructor and he has given me more advice to go with that offered here and I need to try again on Thursday evening!
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Your instructor should be taking you through mini CBL, then a CBL
On the lift don't wait until you feel any acceleration to start dumping; once upward movement starts you can release small amounts of gas to control the ascend. Remember the objective is to recover an unconscious diver without injury to yourself.
Welcome to the wonderful of diving, there are amassing things to see and do.