Ok so this one isn't my own tip, it's from Martha Stewart. She's so smart...even though I bet "she" didn't actually come up with this tip, her staff did...but I love her all the same.
I'm pretty sure this one photo will explain it all, so here ya go!
Do you see what's happening here? When hemming something, draw a line on cardstock for how large you want your hem to be, then just match your fabric edge to the line and iron! SOOO GENIUS!! I'm actually bummed I can't take credit for this one. I do have one of those metal seam guide thingy's, but this looks like it would save so much time!
However, I have one issue...if your fabric isn't cut straight, this wouldn't work as well. A perfect, accurate cut of fabric is essential, mmmkay
Don't you think this is fabulous?? That Martha, she's da bomb!