Side to Side
Work your dog off both sides at every level of training. That way in a trial situation it will not be startling to your dog when you switch sides. Practice walking at your side on and off leash from both sides. Personally I have found that ‘heel’ for left and ‘side’ for right work beautifully for my dogs. I also tilt my head to where I want them to be as an additional cue. From there, work your way up to sending over jumps and through tunnels from both sides. After you have that down pat, try send aheads from either side! Soon you’ll have an ambidextrous dog!