Can't cut straight worth a darn

I made up my own Xmas cards, embroidered the lace angel on my embroidery machine, grabbed a new card, cut a hole then put a backing on the hole. The angel is glued on and can be removed to hang on the tree. SO far so good as long as you don't look past the angel at my crooked cut. With dull kitchen scissors, and a crooked ruler what does one expect. Heck I can't even color within the lines