I use this checklist to confirm my camera is set properly and this keeps me from making dumb mistakes during a photo shoot. I have this laminated and tied to my camera bag.
1. Highlight the graphic below, select Copy Image.
2. Start MSPaint
4. File, Print, "Page Setup"
5. Set Portrait, Scaling: Fit to 1 x 1 pages; Margins apx. 0"
Print on 8.5x11 paper.
Cut into a tall, vertical strip; Fold in half; Take it to Kinko's and laminate for $2.00