Okay Guys - I bought the self healing mat, cutter, and ruler came with it. I want to cut some tapered bands. Now I watched videos on youtube on how to perform this task. Where I am somewhat confused is the very first cut. I want to make 3/4" to 1/2" tapered band 8" in length. The length is no problem - I can figure that out without taxing my addled brain too much.

Where I need help is the very first cut. So at the top of the flatband material I measure an inch in, and mark it. It's the bottom which I want at 1/2" - how do I measure? I've seen videos where the top is measured at say an inch, then measured at the bottom say 3/4" but there isn't a first cut. Then on other videos I see guys make a first cut to get the angle then discard the excess. I hope I explained this properly! Any assistance is greatly appreciated.
Thanks!
Rich