[heliophobicdude]

Probably not the answer you would like but I think your approach to download them and figure out how to run them on your machine is a good one. You don't need to understand everything to get something working. It can be overwhelming and unproductive to know everything before getting started.

To learn more deeply though, get started with getting it to work and when you are curious or something doesn't work, try to understand why and recursively go back to fill in the foundational details.

Example, download the code try to get it to work. Why is it not working? Oh it's trying to look for the model. Search for how to get the model and set it up. Then key step, recursively look up every single thing in the guide or set up. Don't try to set something up or fix some thing without truly understanding what it is you are doing (e.g. copy and paste). This gives you a structured why to fill in the foundations of what it is you are trying to get to work in a more focused and productive manner. At the end you might realize that their approach or yours is not optimal "oh it was telling me to download the 65k model when I can only run 7k on my machine bc ..."