My first SMD project

This my fist project with SMD circuit. I ignored SMD because the small sized parts are confused me. The circuit of current SMD project is the headphone amplifier with TPA6120.

Step 1 Design schematic and footprint

I designed three PCB of this really simple schematic for prototypes only. Finlay I will use this headphone amp within my bigger project of modular audio mixer. The official schematic is really simple, but unbalanced/balanced converter required. I did not found footprint for this project, I have to create it with Altium Designer. This part have 20 pins, bit the 21st pin is on the bottom of circuit, which is the heatsink and the GND.