In the universe, the only guaranteed certainty is change.
Momentum is taking objects from one place, one state to another any given second. Sometimes as humans we forget that we are just an insanely small part of the universe, and we think we are immune to what is going on around us.
So, when things change there is really only one way to keep moving in a positive direction, and that is to do something different.
If you choose to do the same things over and over again out of laziness, fear, ignorance, or any other excuse, eventually you are going to take a fall you may not be able to recover from (ask blockbuster how doing the same thing for years worked out).
The goal is to do what you want to do, and be able to cover the cost of your living from it. Sometimes, this means tapering off your expectations so what you are trying to achieve in hard times of change seems reasonable. Do you really need a 10 billion dollar business? Would you not feel fulfilled with a 10 million dollar business if you started from nothing?
Of course, change is hard, and full of uncertainties and that makes it scary. But if you think you can avoid change, if you think you can avoid things happening to you (good or bad), then you are kidding yourself. You are not immune to the laws of the universe.
You are fortunate enough to have the power of making decisions. You can decide what path you go down, more or less. But remember that not making a decision, is still a decision.
In a constantly changing world, we need more innovative and creative thinkers taking action. Only by breaking out of the normal, from what has worked in the past, will we find what we really need to face future challenges.
You can do it. Whatever it is, it can be done given enough work and time. But if you are scared to change, and then scared to continue taking action, you will never know what could have been, or how many people you could have helped. So go do it.