When I was learning how to shoot trap, 2 things were of great help after I had applied what I had been told (follow through, don't stop the swing, head up, etc) and was still missing more than not:
I had an experienced shooter look over my shoulder and call the shot. If my lead was too much or too little, he'd say "Ahead of it", or "too low", whatever.
Someone had a box of 12 gauge trap load tracers. We often found that 2 or 3 of them were all that was needed for a learning shooter (which is everyone all the time no matter how long they've been at it) to see what his or her mistakes were and jump his score a bunch all at once. I don't know if tracers are still available.
Despite the cost of living, have you noticed how popular it remains?