Re: dialing in your welder feed rate setting
Along with all the other good advice I've seen in this thread I'll add finding a comfortable position. You'll find your welds much better, more consistant and smoother if you're comfortable while laying a bead. If that means propping your elbow or arm on something, so be it. I've found it beneficial at times to steady your stinger hand with the other one. Whatever it takes to be comfy will make it easier to control the arc.
Awkward unsupported positions are sometimes necessary, such as inverted welds (welding upside down) and professionals can do it but for the average hobbiest it will improve your skills to find a position that you can hold easily for the time it takes to make your weld.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"