This is not necessarily a quilting tip, but something I use all the time. I sew on vintage/antique sewing machines so there is no automatic threader. I was watching a tip and tricks video about vintage machines and this was IMO the best tip. To make it easier to thread the eye of the needle, cut the end of the thread at an angle. It works most of the time and I also use it for threading hand needles.
Shari