You're getting some good advice; follow it.
I will reiterate what others have said by emphasizing looking out past the short guns particular put the flyer and finding that long gun and watching the bird to the ground.
On blinds I would agree with Paul's advice but I would also say that's a double-edged sword for hunt testers moving up
I've seen hunt testers try to win the trial in the blind be too precise but I've also seen them let em roll offline through an area where a hazard is and in the judges eyes not really challenge their blind. Then they wonder why they got dropped when they only use two whistles and somebody else got carried using 6 or 7 whistles
If the true line to the blind goes past an old fall or the flyer crates used in the first series you better be pretty close to that line at that point.
This is a generalization but I would see the hazard that Paul put in on being too precise and losing momentum is more applicable to water blinds, whereas the hazard I pointed out as more applicable on land blind.
I would also re emphasize SLOW DOWN!!
Not only as has been pointed out to ID gunners and on the send, but I also often see em move too quickly to the next gun station as the birds are being shot. That only reinforces the dogs tendency to head swing Make the dog see the bird all the way to the ground and then some.
If you're not running as one of the first dogs study the judge that's calling for birds and get his Cadence down. If the judge has a slower Cadence use that extra time to make that dog really focus on the bird thrown before moving to next bird.
Lastly relax as best you canand enjoy