This morning I made a video tutorial showing how to customize shipping options when using GSP (Global Shipping Program). This is my first ever video and I didn't really prepare ahead of time so my apologies for the long hesitations in the beginning. I probably should have done it over again but I'm lazy :) One thing I forgot to mention in the video is you can go into your old listings and change them as well but I don't think you can do it as a bulk edit so it does take a long time to change old listings if you have a large store. I'm not sure why the video is blurry when enlarged. But again I'm lazy so I probably won't be redoing it. I hope it's clear enough for you to tell what I'm doing!
Edited to Add. When you add alternative shipping methods to a country that shuts off Global Shipping Program for that country.