Here is a step-by-step guide on how to use a tattoo gun:

1. Sterilize your equipment and wash your hands.
2. Assemble your equipment if you haven’t already done so.
3. Set the needle length.
4. Place everything as you need it.
5. Plug in the tattoo gun.
6. Start pouring in the ink you’re working with.
7. Do a test.
8. Start tattooing.

For more detailed information on each step, please check out this [step-by-step guide](https://www.floridatattooacademy.com/a-step-by-step-guide-on-how-to-use-a-tattoo-gun/) from Florida Tattoo Academy.