Any "trap launcher" that you're hauling into the woods isn't giving you near the practice or variety that a club does. I've put many new hunters into the layout boat who have "practiced" and fired thousands upon thousands of rounds at birds thrown from a "trap launcher", and watched them empty box after box into thin air on decoying divers.
If you want practice, shoot skeet, five stand or sporting clays, and shoot it often.
-Nick