Check (if you haven't already) the adult education program at the local high schools; you might get lucky. When I lived in Grass Valley, I took some welding classes to brush up and catch up (had not had a torch in hand for about ten or so years) at the high school there. The teacher ran a fabrication shop in Nevada City, and was very sharp. The courses were at night, for three hours. You being in Marysville, with all of the ag-industry around there, there should be something similar around.

As for me, I can do almost any welding task reasonably well, but MIG is my real weak spot; feed vs. heat vs. wire size - just not as good a result for me. Maybe I truly am a luddite. On steel, an oxy-acetylene torch and enough time will get me great results.