When plans fail, it might be because you have not carefully considered the initial situation.
Leaps happen, but it is much more common to have things develop slowly, thanks to incremental and non-linear progresses.
And so, a great way to start a plan is to take a careful look at where you start from. What resources you have available. What people around you want. What initial wins you can get to start momentum. What it is that you can realistically achieve without changing most of what is going on.
You might know where you want it all to end, but if you start there, that is little more than wishful thinking. Taking little steps is the surest way to achieve success.