By Brian O’Connell The hardest part of investing is sticking to the rules you establish according to Real Money Columnist James ‘Rev Shark’ Deporre. There’s a saying among football coaches and wartime generals that theory is one thing and execution is another. That’s been especially true of the the stock market this year as it’s been buffeted by inflation, rising interest rates, and Putin’s invasion of Ukraine. In such circumstances, it’s reasonable to expect missteps in execution, according to Real Money Columnist James ‘Rev Shark’ Deporre. “Let’s face it, you’re going to be undisciplined and…