Before doing anything else, make sure you have all parts:

• 16 diodes (1N41482)
• 16 switches (cherry MX compatible, 5 pin ideally - but 3 pin will work too)
• 16 keycaps
• 3 resistors (10K)
• 1 Fri3d Camp 2022 badge or 1 XIAO/QTpy board

Optionally, depending on what you want to do

• 2 rotary encoders (with or without button fuctionality)

Use the diode bender in the corner of the PCB to bend the leads of the diodes. 

The resistors are only required when you're using rotary encoders.

Preheat your soldering iron to your desired temperature and start soldering the lowest parts first. In this case that will be the diodes and resistors.

The boards supports hot plug sockets for MX switches, if you have those on hand, now would be the time to solder them on the bottom side of the board. Otherwise you can just solder your switches on the PCB