[QUOTE=Teeler;5830088]While I'm only a beginner, I found that matching my points was easiest when I stuck a pin straight through from the back of one point, and through the point of the matching one. I could then line up the rest of my block for sewing, and pin the rest of it and the points didn't move.
This is the method I use as well as pressing open and making mine a tad oversize. Trimming HST's is the best reason in the world for owning a rotating cutting mat!