Feeding wire one handed has been the most difficult to learn for me. I have heard that new welders will sit for hours watching TV or something while feeding wire over and over. Like learning to juggle.
There are at least 3 quite different methods. The weird part is advancing the wire while compensating by moving the hand away. A very good way to do this is to cut a slot in cardboard or sheet metal and practice sending the wire through the slot while moving it back and forth and not side to side. The slot need not be long, a 1/4". Wire can enter the puddle from 10º to almost 90. So a lot of method has to be practiced.
But at the same time you don't want to remove the tip of the wire out of the inert gas zone. Even as you end the weld and shut the arc down. Wire and tip cool down from red to gray in post gas flow before you pull up.
If you can pat your stomach and rub your head at the same time while walking, you have a head start.
