"I want to be able to play hockey with my buddies once a week"
"I want to look my best and feel great"
"I want to have more energy to invest with my family and friends"
Once you know what you are working towards you have to assess your strengths and weaknesses . Know what you can realistically accomplish by playing to your own strengths. As valuable as it is to be able to improve upon your weaknesses, the easiest and most effective way to create momentum in your life is by starting with the things you are already good at.
Instead start to prioritize movement as a necessity in your day (walk, swim, bike, whatever). Can't imagine hitting the perfect balance of carbs, protein and fat, starting this instant? Why not address some of the deficiencies in your diet by starting a quality multi-vitamin and fish oil supplement. Start small and build from there.
I would argue that what's most important is recognizing what you can consistently accomplish. Nutrition and fitness, as many things in life is not a 'one and done' type thing. Like any other personal trait, it is a gradual process that you continually work at to instill as a part of you. Consistently making the right choices is what creates lasting change. In order to have success you need to be continually creating opportunities for you to succeed; and once you've felt that success, build on it.
A properly designed nutrition and fitness program is going to help you OPTIMIZE your life. It's going to ensure that you are properly fueled and have the energy to make the most out of every day. It's going to give you confidence in yourself and in your body whether playing a pick-up game of basketball or going out for a night on the town.
Just like a muscle that is continually worked, constantly challenging yourself to improve is going to invoke growth. There is no silver bullet, but commit to gradual and steady refinement and one day you'll look in the mirror to find yourself transformed into the person you imagined when you started the whole process.
Live Your Best Life!