The hardest part is to keep it up without making any excuse. 

You’re gonna face health issues, relationship issues, financial issues, self-doubt issues, and if not you, people who are very close to you will, and you will stand by them and support them, 

and many months or years might suddenly pass before you know it,

but if you are truly serious about your goals, you will build an environment that will allow you to make progress regardless of what life will throw at you,

you might occasionally slow down, but you will never stop,

then you will step back one day, a bit older, a bit wrinkled, you will look at the beautiful vision you’ve built out of your own resilience and long-term focus, and you will feel mentally at peace, confident, and fully satisfied with what you’ve overcome and accomplished.