WARNING: DO NOT ATTEMPT TO USE THESE FREQUENCIES WITHOUT PROPER TRAINING. YOUR BRAIN MAY TURN INTO A SLICED TOMATO.
Get yourself into a room with no windows, no distractions, and a minimum of 4 walls.
Make sure it's also a room with a high concentration of brain-protective padding (e.g., thick carpet, lots of pillows).
Proceed to Step 2Use a reliable frequency generator to set the alpha waves to 8-12 Hz. If you're unsure, just set it to 10 Hz. It's not like it's rocket science.
If you're feeling fancy, you can try to generate a 4-8 Hz delta wave for some bonus brain-melting goodness.
Proceed to Step 3