Remove the old flooring and clean the shower base
Inspect the subfloor and repair any damage
Ensure the shower pan has the correct slope to the drain
Install a waterproof membrane or shower pan liner
Mark the drain location and dry-fit the tiles
Mix thin-set mortar according to the manufacturer’s instructions
Spread thin-set with a notched trowel
Set the tiles starting from the drain and working outward
Maintain even grout joints with spacers
Cut edge tiles to fit around the drain and perimeter
Check tile slope toward the drain as you work
Allow the thin-set to cure fully
Remove spacers and clean excess mortar from joints
Apply grout to the tile joints
Wipe off grout haze with a damp sponge
Seal the grout if required
Apply silicone caulk at changes of plane and around the drain
Let all materials cure before using the shower