tile leveling system
New LASH Tile Leveling, Aligning and Spacer Leveling System Pliers Indoor Black #QEP
Go through this article Raimondi Floor Tile Leveling System and get the tips and implement it. This precise that by getting these tools so you can do it yourself.
Tile Tools - Raimondi Tile Leveling Clip 1/16" Spacer (Bag 250)