Step 8: Time to grout.
We were boring and went with a white grout. We thought it would look best with the light blue tiles and the white in the background of the sink. It's also in a bathroom, so we wanted a fresh, clean look. There are all kinds of colours of grout though, so don't be limited in your imagination!
Following the directions, we mixed up a bucket according to weight. (Weighing is a more accurate measure than by cups, ask any baker) Again, this stuff is kind of toxic, so use gloves and don't breath in any of the dust.
We mixed a bucket only to find that we didn't have enough. Mixing up more was really no problem. I was worried that the second batch might not match the first, but there's no difference at all.
You need a special grout squeegie (can't remember the name...trowel?) that has rubber on the bottom. It's flexible so that it can squish the grout in the cracks but it's not hard enough to scratch the tile. Always grout on the diagonal, so that you aren't inadvertently dragging grout out the cracks. Work the grout into all the nooks, up the backsplash and around the trim.