Clean the tile joints and remove spacers, dust, and debris
Mix the grout according to the package instructions
Let the grout slake if required, then remix
Use a grout float to spread grout diagonally across the tiles
Press grout firmly into the joints
Remove excess grout with the float held at an angle
Wait until the grout firms up slightly
Wipe the tile surface with a damp sponge
Rinse the sponge often and change water as needed
Shape and smooth the grout lines as you wipe
Let the grout cure for the recommended time
Buff off any haze with a dry cloth
Apply grout sealer if the grout type requires it