The click sound must occur simultaneously with desired behavior, so have device handy to capture it in precise moments.
Click Quickly
Back up every click with a highly motivating treat or toy to build the association between click = earned prize.
Reward Each Click
Wait to attach verbal or visual cues to actions so clicks remain "marking" the right behaviors instead of commanding them.
Add Cues Later
Sometimes reward clicks with treats, sometimes pets to keep dog engaged. Vary unexpectedly.
Mix Up Reinforcement
Prevent "trigger happiness" by only clicking truly desirable exceptional behaviors vs. every minor thing.
Avoid Over-Clicking
Rule out confusion, satiation, poor technique or device failure if clicks ever lose their power and effect.
Troubleshoot If Needed
Phase out clicker for well-known skills so it maintains novelty and impact teaching advanced tricks.
Use Discriminately