Once you've understood that you are in control of your mood, emotions and overall mindset - you will become unstoppable. Whether it's reaching new goals in your life, accomplishing something that has troubled you or overcoming a major life challenge.
It can be overwhelming and seem fluffy at times. I resisted this concept for a long time myself, but once I got to the point that I was fed up with my days being overcome with anxiety and depressed and feeling trapped in all the negativity that I found following me around - I decided enough was enough.
After all - what harm was there? All this light and positivity couldn't make anything worse, right? Dive in wherever you feel comfortable.
I personally started with Gratitude on my main focus - but you can start anywhere! Just START! Your future self will be happy that you did.