Another useful program for panos in Microsoft Image Composite Editor - MICE. It’s free to download and use and will stitch 360 degree panos and rectangular ones taken by phone.
Skies are a pain. I’m slowly coming to grips with them. It is useful to have a library of skies you can use to “fill in the blanks” and that nice @milkmanchris has one available here
If you want help with 360 panos and Kuula I might think about an illustrated guide though I’ll probably get laughed at for doing panos in my own cack-handed way 