Non-video guide for rupping GBA sprites

I know there's a video, but it's very difficult for me to use video tutorials effectively if at all (for many reasons) and I honestly find most of them deeply obnoxious even if they contain useful information. 

Is there any sort of non-video guide for the basics of ripping sprites from GBA games (specifically Tactics Ogre: The Knight of Lodis, if that affects anything)? I would really like to just have some text and maybe the occasional screenshot to read.