With my AP kit, i basically trimmed off all of the top return except for about 1/16" and then sanded them. I made sure to sand them in such a way as to leave a radiused edge or at least not a sharp edge pointing at my leg.
I then put padding in the front of my shins right below the knee to fix the shin piece in place when walking. No cuts or anything.
EDIT: if you want, i will take a photo of my set up tonight.