Of course, the guides can be a bit sloppy.
First, if you want to install only windows I did not have any luck with that.
If you still want to keep dual boot,then I can help.
First download the correct version of android and windows for your tablet. On the back of the tablet you have serial number and search for one the closest here:
To flash windows just download the windows .zip, format your USB with NTFS and name it WINPE, then drag and drop all files to the main directory of USB. Then boot the tablet up and keep pressing F7 until boot screen comes up. Select your USB and thats it, everything else will be done automatically.
Do tell me if you need help with android or you have any other problems, im new to chuwi but wil like to learn more about it. When windows boots up, don’t connect to wifi but disable auto windows driver updates.