The guide is pretty slick. I also recommend just watching a couple videos on it and using ChatGPT to walk you through basic things. It’s not too hard once you get into it, even if it seems hard at first (although I am terrible at using Inkscape and am not actually good at SVGs, honestly).
Follow the guide people linked in other comments and also do lots of them so you can understand Inkscape and all of its features. Worked well with me, I fell in love with Inkscape lol.
It's a bit of a learning curve, but anyone can learn how to do it. Install a program that lets you download SVG templates off the internet, as well as Inkscape to edit the SVG. Learning all the mechanics of Inkscape is the most time consuming part, but one you do it's a breeze.
Also forgot to mention, but make sure the SVG doesn't have too many nodes (those little squares on the lines) because if there are too many, the file will be too big to upload to JetPunk.
You are great