I was taught (lo, these many years ago) to be careful to only use my hands to GUIDE the fabric through the sewing machine, but to let the sewing machine do the actual work of moving the fabric.
And for the last 10 years one of the things that I could never do well - something that seemed like it should be simple - was sewing large rectangles together. They would always start out lined up nicely, and then end up out of alignment - often with little fabric bubbles. Even when I used my walking foot (although that did help).
Making 9 casserole totes required sewing A LOT of large rectangles. So I tried something new. I held the fabric taut and kind of pulled it through my machine. At first it felt wrong - but, you know what? It worked! My rectangles came out nicely aligned with basically no fabric bubbles across all 9 totes. :)
It may help that my machine is mechanical, not computerized.
So, how about you? Are you careful never to push or pull your fabric through the machine? Or do you sometimes take control? What do you think about this?