Drywall mud is nothing compared to tile grout. That shit knows you're terrified the second you step in the store. It's laughing at you while you stare at the various bags on the shelf, knowing that you will inevitably mix the wrong amount of water and end up with a thin-set mess and uneven floors. A grout float? Hah, good luck aspiring DIYer, the only floating you'll be doing is in a bath of your own tears after you realize how much you hate tiling.