1. Open a margin account on Interactive Brokers.

2. Choose a target volatility level you're comfortable with (I like 20%).

3. Buy shares of BRKB. Buy enough such that volatility of your portfolio reaches your target volatility.

4. Every month, update your share amount to maintain the same target volatility.

https://alphaarchitect.com/2019/05/22/volatility-targeting-i...