Okay. I'm a little bit drunk so hopefully this will make some sort of sense.
For the ST3 pliers. This end isn't keyed so open the handles, they will press on the barrel.
You want to turn the screw side which I believe is the slightly thicker one.
If using needle nose pliers go in from the side and for blunt nose or vise grips go end on.
Being left handed, I hold the blunt nosed pliers on my left and the ST3 on my right.
Once I have a good grip on the screwhead I brace my left arm against my side while I rotate the ST3.
Heat as needed. I think I have only once needed to use pliers on both sides.
For the Rebar tools. The barrel is keyed. The screw end is on the file and saw sides.
One thing I do know is that the Crunch works very well on these fasteners.