Your time could be better spent than messing with a bunch of holding blinds. One is enough but half the time don't bother with any.
As to the collar.
Put ecollar on dog while it is still sitting in hole on truck. Or if kennel setup prevents this, put ecollar on dog before you put him on ground.
When dog hits ground, SIT.
Next call dog to you and clip on pinch collar with training tab attached. Trading tab length should be set so when holding knotted end in 2 fingers and dog at heel sit you can just hook thumb into your jeans pocket.
Hold tab always unless dog is retrieving.
Do not use leash for training at all. Training tab and pinch collar along with ecollar only.
For tests you need a "traffic lead" with choke chain built in.