These topics can't be detailed in small email space but a few points can.  First, the main obstacle to change is "Habits of Thought & Attitude", and yes there are great habits for a full life and perilous habits that stifle and possibly kill you.   

Here's a simple yet powerful fact: You have to STOP something before you START something! You just don't "stop" eating, drinking, smoking or any other habit. You must displace and replace one habit with a different one, one that's preferably the opposite of what you are stopping. To paraphrase physics,Humans Abhor a Habit Vacuum!  

Another harsh reality is this: 99.999% of all habits DO NOT change overnight! Life- changing results require such things as "Spaced Repetition, Saliency, Successive Approximations, Tracking, Goal-Setting AND Feedback, Feedback, Feedback". Done incorrectly any one of these will pose hazards and obstacles that will set you back into your old ways.  

This is where the Integrated Implementation Process comes in. Changing only one thing, even one clear and salient thing, will NOT increase your odds at achieving the life-changing success you seek. A trusted ally, a coach, has to help you understand the other pieces of the picture and guide you in integrating all the pieces into one whole. This concept is easier to visualize when improving your physical well-being. For example: My total right knee replacement was a clear, wonderful change from a worn out knee joint. I expected to right away walk normally again but it didn't happen.   

It turns out that the entire lower body had been compensating for the dysfunctional right knee; thus it didn't know how to work correctly with the new knee joint in place. I had to re-teach other joints, tendons, ligaments and muscles AND my brain how to walk correctly. These hidden habits require a licensed physical therapist for me to overcome old habits and achieve lasting change.  

The bottom line is this: Before you will ever possibly get lasting results you have to clearly identify the obstacles in the way of changing - not just the visible "out there" ones but also the "in me" obstacles. Defeat those inner barriers and change that produces life-long results must inevitably come to pass.