I learned that a coping saw works well for cutting a scarf, but maintain the same pace throughout… Don’t rush when you are this close to finishing the cut.i actually used a flat rasp to remove stock then cleaned it up with my smoothing plane. I glued this shortly afterwards.
Lutherie... 
I am learning the same lesson of patients. It is difficult when you get close to finishing a certain part when you want to get it done quickly so you can see the result. One day I will learn to just relax and be patient so that what I finally see will be something I like.