Jackson picks up on tricks very quickly; he always has. Some take much longer. Honestly, 90% of the tricks that Jackson knows are hand signals. I honestly don't think he listens to the word I am saying along with the hand signal, except for sit, down and stay. I would like to work more on verbal commands though. I do try to fade out luring though but a hand signal is not a bad thing.
This is an old video, and he has more stuff now, but I do almost all of this with some kind of hand signal: