That is, to me, one of the most difficult things to apply in life, and I feel like the rest of your post doesn't exactly provide an answer on how to achieve this. There are so many things that I want to do in life but that I cannot afford to do now, and which I always postpone to later. And it feels like I'll let a great deal of things unachieved because I'm already too busy on things that are consuming my time right now.
The same applies to budget. I try to save as much money as possible for the future, and thus I restrain myself from doing things that I may consider too expensive for what they are worth, or choose not to do/purchase things which I do not consider essential as much as possible. I think I managed to do quite well up to this point (I'm 22 and have 20K in savings, starting from barely zero), but I'm still questioning on the utility of doing all of this. Even if I lost all my sources of revenue tomorrow, I wouldn't survive for a very long time with my savings. And if I wanted to launch some business in the near future, I doubt such an amount of money would take me very far.