I pin when needed to prevent shifting.

I usually pin.

Same here. If it's a small seam, I don't pin. If it's a seam with a lot of intersections, then I will put pins at the intersections. Totally depends on the specific situation. One thing I never do is to sew over a pin. I will always stop my machine and take the pin out rather than risk breaking a needle or pin or doing damage to my machine.

Only if I'm trying to match points - then I'll match them up with a pin and then pin it in place. The rest goes as the fabric leads me. Mind you, it doesn't stray because I've starched it within an inch of its life!

I wish I could say that I never sewed over a pin, but I INTEND to remove pins before I get there.

I only pin if it's absolutely necessary; I don't have any problems with fabric slipping because I starch the devil out of it.

Depends on what I am sewing. LOL The U shaped pins are often used by some at the matching seams.

I find that if I'm carefully iron, making sure that seams to be sewed are ironed in the opposite direction, the I use my fingers to place on seam up against the other. It saves pinning

very very very seldom do I pin.

I don't piece with pins at all, but always do with my binding. I just hate using pins.