Turn the 3D printer on using the power switch.

Move the head to the highest position on the Z axis. This provides working room to access the head.

Heat the nozzle up. This step depends on what type of filament is currently in the machine (e.g. 190 for PLA, 220 for ABS).

Remove filament from the 3D printer.

Clean off the old nozzle with tweezers.