I've got a Franklin pipefitters and welders handbook. Got it when I finished my apprenticeship in the union, great resource has all your layout instructions.
here ya go: you can enter your measurements and print out a template to trace onto the pipe. Ive used it with success - I did have to grind a bit bc of my "shake and bake" plasma cutting skills. https://www.blocklayer.com/pipe-notchingeng.aspx