Hey, Smiley.
I am right handed and I hold the lock in my left hand, the same hand that I use my 3rd, 4th, or both fingers to apply the tension to the tension wrench.
It works well for me because it gives me a lot of tension control, but may or may not for other people. Do what works for you and as long as you can ease off on the tension when you need to, that's mainly all that matters at this point.
OR:
Hold the lock with your left hand using your index finger to cover the brand on the front. Put your thumb on the underside. Using your middle finger, press on the tension lever and the keyway should be trying to turn clockwise (as you look into the keyway).
To turn anti clockwise, keep holding it pretty much the same, but this time use your thumb to push the tension lever.
There are many many variations of this, and I'm sure that you will find one that is right FOR YOU.
You could always try putting the tension wrench in the lock, sit on your right hand, and tell yourself to just turn the thing in as many ways as you can think?
Might help you better than someone elses idea of comfort.
