Usually I trim kinda sideways, walking forward but at an angle somewhere between a straight walk and a crab's gait. I can walk straight forward but I only do that on occasion like when I am in a hurry, I find it misses a lot and the angle isn't the same.
But if I'm just goofing off, I can weedeat right or left-handed, with both hands or single handed, trimmer right side up or upside down, throw it from one hand to the next in the air and play with it like that and the other day I figured out how to do it with the trimmer passing behind me lol ! Worst thing is you have to watch that string, it really hurts and for some reason the stihl balances the best, I can't get too fancy with the echo.