I leave my pins in until I'm *almost* right beside them with the needle, then pull the pin before going on. It's sometimes slow going when there are a lot of seams, but the end result is worth it, to me. But if it's not a seam intersection I don't pin and don't care if my seam allowance flips over - the only reason I care when there is a seam intersection is because of the extra bulk a flipped allowance would give in that one spot. My machine does pretty good over bulky seams, but I like to help her out where I can, lol.