I approached Mustachianism very differently. I began with the life I want to live and what true freedom meant to me. This is very personal and takes a lot of time. I strongly recommend watching Adam Baker's TED talk, it just made sense to me and I hope it helps you too.
http://youtu.be/9XRPbFIN4lk Also, re-reading the classic book "Your Money or Your Life" really helped create clarity on "how" I wanted to live my life. I wasn't looking for a career change specifically but I wanted more time to dedicate to meaningful causes and to spend time with loved ones. So to get to the point where I could begin creating the life I wanted, I knew well before MMM, I HAD to save more money and make every penny I earned work for me. No one cares about your money more than you do! I kept this truism in mind as I carefully went over all of my expenses, work benefits (HSA, 401k, medical, dental, vision, insurance, et al) and determined which ones I could optimize and which I could reduce/eliminate. Additionally, I spent a lot of time consolidating funds/accounts and assets so I had economy of scale working in my favor. E.g. rolling over old 401ks into an IRA or Roth and setting up direct deposits into discount brokerage accounts with automatic contibutions into specific index funds like how MMM suggests. Also, I treated my possessions as if they were all radioactive cockroaches and I got rid of most of them (selling and donating). And you guessed it the proceeds went straight back to work. Try it you'd be amazed how liberating it is to see more space in your room(s) and to feel free of the weight of stuff.
Having clear goals helps focus your limited time and energy. However, isn't it true, you do not need to wait until you crystalize your goals before you create financial plans to help get you closer to your goals? My recommendation, start aggressively saving now, before lifes little bumps, distract or potentially derail the momentum you've carefully built. Good luck and keep us posted. Cheers!