Ultimately, whether to smooth tiles before or after installation depends on personal preference, the condition of the tiles, and the specific requirements of the project. If you are aiming for a flawless and uniform appearance, it is generally recommended to smooth the tiles before installation. On the other hand, if you prioritize efficiency or require more flexibility in terms of customization, smoothing the tiles after installation may be a better option.
In either case, it is essential to ensure that the subfloor is clean, level, and properly prepared before starting the installation process. This will contribute to a successful and long-lasting tile installation, regardless of whether you choose to smooth the tiles before or after.