1. Never cut at night (the lighting stinks in the cutting area at night).
2. Keep a pin cushion and seam ripper in every room. It saves time.
3. Always check measurements on all blocks/sashes/borders before ripping them for the 3rd time. Sometimes the mistake is somewhere else and has "traveled".
4. Press seams.
5. Hot irons look just like cold irons so don't catch one as it falls to the floor.
#5 is really important. Ask me how I know.