Eleanor Burns has a square (actually 2 - one for up to 6" and one for larger) that you use to square up HSTs while they are still folded. Two cuts and you're done, which is much easier.
Originally Posted by
sewbelle52
There is an easier , faster way posted on
www.diaryofaquilter.com. Scroll down her blog and you will see her tutorial. She shows you how to square them up while they are still folded! Cuts your time in half! From now on that's the way I'll trim them.