I've only been around the ones too big to have a blade. The guy I learned from was a lifetime heavy equipment operator and just started digging however he got to the spot. If it was more efficient to "back" to the spot then the back was now the front. I followed his lead, unless I was going to be in a rocky area long enough that it didn't waste too much time, then I would make sure I was digging on the idler side.
Also, don't dig the dirt out from under you, you might just fall over. I was also told that if you are digging at the side of a drop off to dig at least at a 45 so the counterweight does not go past the tracks on the drop off side. Goal being not to have the tracks parallel with the drop off, from perpendicular to a 45 is ok.