Hobart Handler 140 Mig Welder "birdnesting" Questions

...are turning back off the tension and add just enough tension to make it feed the wire and check for birdnesting(the wire balls up inside the welder), if this happens cut the wire, pull out the bad ...

I have not used a wire welder very much. A friend encouraged me to try the one he had. I ran it out of wire before welding hardly any and when I tried to put the new spool in I could not get it to ...