I know you said you can’t be trusted with scissors, BUT... if you’re going to be doing a lot of smaller sized work, you might be pleasantly surprised at how user friendly paper trimmers have gotten to be. Fiskars makes a really nice one that cuts paper up to 12”x12”, has a self-sharpening blade, measuring grid (premarked for 4x6 and 5x7’s) and a groovy mechanism that ensures a completely straight cut. It sells on Amazon for $21. It will cut up to 5 sheets of regular paper at a time but can also handle stuff like card stock. Fiskars 152490-1004 SureCut Deluxe Craft Paper Trimmer, 12 Inch https://www.amazon.com/dp/B0038F1A0S/ref=cm_sw_r_cp_api_i_bP.CDb5F34YYF