Make sure your signals are clear and distinct. Use opposite hands if necessary. Watch your signals in a mirror...do they look different enough?
Tips: Make sure your palm is facing the dog. This means when you give the down or sit signal your palm should not be facing up or down because it is too small for the dog to see.
Here are my signals:
Stay: right hand, Open palm held in front of the dogs nose. This is a crisp signal, not a slow motion one.
Stand: if stationary (like Novice SFE), right hand open palm facing right in front of the dog's nose then moving forward away from the dog (this signal is different from stay because it is moving). For moving stand, left hand, open palm facing down moved forward in front of the dog
Heel: left hand, scoop down and forward then place back at my waist
Down: right hand up in the air (like the Nazi salute) and drop arm towards the ground in front of me with palm always facing the dog
Sit: left hand at my side, move hand up toward my shoulder (no higher than shoulder height) palm facing the dog (think
Come: right hand, raise straight out to side to shoulder height, scoop around in front of me, back to my chest (kind of like patting yourself on your chest).
Around finish (right): right hand, scoop out from my waist (palm facing backwards) around behind me (think wiping a smell away ).
Swing finish (left): left hand, shoulder height in front of you with palm facing out (thumb would be down) push to the left side (palm is now backwards) staying at shoulder height.