I use a large Fiskars paper cutter for the most part. When I had to cut down all my Christmas cards this year, I even put a piece of tape on the paper cutter so that I could just bump the cards up against that and know it was lined up in the right spot then whack away. LOL
I've also used a rotary cutter, ruler and cutting mat. That works pretty well for me but I'm a closet quilter. LOL In other words I have tons of fabric in my closet but can't find time to use it.
HTH and HAPPY BIRTHDAY, my feathered friend!