After your trap is set, avoid walking close to the trap or disturbing it in any way, as many traps can be quite sensitive.
After releasing the chipmunk, disinfect the trap before using it again. Use a disinfectant spray and a cloth to clean the trap.
It’s okay if it’s not perfectly balanced. Just use your best judgment to determine whether the weight of a chipmunk on the unsecured end of the trigger will cause the trigger to tip over.
Optionally, you can place a trail of bait up the ramp as well. Use peanut butter to make the bait stick to the ramp without sliding down.
The tree needs to have a branch that’s at least somewhat horizontal and close enough to hang something from it.