Though I am not a Windows user, I do know that following the Windows docs does work as I was able to set up a Trellis-based site on Win 10 within the last few months (2018).
You can try the WSL method as well. @Log1x has a great guide for this:
He also mentions an alternative method to using Trellis, which I have yet to set up for myself. https://discourse.roots.io/t/guide-developing-on-windows-10-using-wsl/9380/22