There are two major factors that go against doing.
The first one is perfection. It’s a myth, something everybody aims for and nobody ever achieves. It is the resistance of having all your ducks in a row, and it delays delivering until a day that will never come.
The second one is analysis paralysis. At any time, we have access to a whole lot more information than what we need to make things happen, and this is unsettling to most. For every piece that tells you to do something, there is one that tells you to do the opposite, and so we lose focus, get distracted and, once again, delay delivery.
Habit and practice are the antidotes.