OMG! be sure to wear a Respirator/Dust mask, the fur is fine and gets everywhere.
It lightens it a little because some of the browns & Blacks are in the hair tips, but that is ok for the ears. The white inside the ears will remain untrimmed, at least for now.
I am using my regular hair clippers with the NO.4 brush attachment and it is giving me roughly a 1/2 inch fur length, about right for the ears.
Once I get the other ear trimmed down I will begin the process of gluing it on. The seams are not something I am looking forward to dealing with, I plan on cutting a couple test pieces from my material to experiment with the overlap technique (dark over light) to hide the seam better. If you shave off a 1/4 inch wide area all the way around the lighter fur you can overlap the darker to make a better looking finish.