Proper 'feathering' techniques

Okay! So i’m pleased to announce i am done with a major portion of my stomach, that being said i’m starting work on thinning out the hair on my arms. The top 1/2 of the arm has thicker and coarser hair then the lower half of my arm, leading me to want it to look like the bottom half. I have a number of follicles on the top half with two hairs growing out of it and/or hair growing very close to the follicle. I am attacking the darker hairs or the ones that do not reflect blond when hit with light.

Lucky for me these things are hitting about a 80% death rate, eliminating most of the guess work involved in regrowth.

So, any of the professionals want to share there experience/techniques with feathering hair?

Thanks in advance

I also realize pictures might be helpful to give you hints, i can do this upon request.