Hope that makes some sense? Basically, I'm sewing square pockets, then sewing these pockets onto thick material and even if I cut back some of the material, am left with some thick chunks of material to get through, quite often on corners. My sewing machine throws a wobbly and won't move the material on, and I can't seem to get it to do so easily (and because it's on corners, I can't help 'pull' the material through, and shoving it
doesn't seem to work either).
Any tips for a shamelessly self-taught beginner ?