Wanting to do it.
It’s as simple and as difficult as that.
Whether you create a story to defend wanting to do it because you needed to, are forced to, or are curious to do it makes no difference.
Only when you want to, for whatever reason, will you keep going when things get tough or when you become disappointed along the way.
Wanting to do it makes time pass quickly, without regret, no matter how many hours in a day it consumes you.
Best of all, it makes everything much easier regardless of the obstacle or the work that is involved.