If you don’t have a USBASP in the parts bin, we’ve seen a very similar trick done with an Arduino clone in the past.

Further, you can upload your sketch from the Arduino IDE to the Arduino board with the help of an FTDI module. Since you have an AVR USBasp programmer in hand,is it possible to upload bootloader ...

To actually get the code onto the chip, the IDE supports using the Arduino as a programmer as well as dedicated hardware like the BusPirate or the USBasp. If you go the Arduino route, [Wayne] has ...