Grouting is a bitch. At least I don’t really enjoy the task too much. I was fortunate enough that the Lindz-inator was willing to step up to the plate on this while I was busy doing some other things (you’ll read about that later).
First thing you have to do is crawl around on your hands and knees and tap the tile with your finger. If it sounds and feels solid – then congrats! You had the right amount of thinset on the floor / tile and it’s securely in place. If it sounds or feels hollow – then boo, you fucked up and skimped a little. If you find yourself in that situation just pull it up, apply more thinset, reset the tile and allow for the proper dry time. When you’re all good it’s time to move on to the cleaning process.