I use my stiletto esp. joining the end of pieces with points such as trianges.
Another trick that I was taught is to use a trailing pin. You put the pin in point first at the pointy end where you will end sewing. The pin should be to one side of the where you sewing machine needle with go thru the fabric. As the feed dogs pull the fabric away from you, just hold the top of the pin and slowly let it slide out of the fabric as the fabric moves.
You will finish with a perfect 1/4 inch seam rather than one that veers crooked. Works like a charm. Just be sure your sewing machine needle doesn't hit the pin. I hold the pin start helping it extract before the machine needle reaches it. Stitch slowly at this point.