Oh LAFF I can recall being terrified to cut into anyone fabric. And errors are still happening after many years!
Once I was doing a block and found out the lady taught at a quilt shop. Oh my - I was petrified! But I made it through. When I look back on the earlier blocks I find I really did well. Matching the colors and requests of the swapper along with 12.5" is the necessity. Difficult blocks are not!
I do love Suzi's block as well as the others. Good start. Now breath and don't rush.