In his post ‘But why does it take so long?‘, Seth Godin states that “Persuading ourselves to move forward can take even longer [than doing, coordinating, persuading, pathfinding…]”
I find this observation very much to the point: although building something takes time, for the vast majority of people, just deciding to start takes even more time (and sometimes an infinite duration as they never get to start).
It is only by trying many things that one finds what works for himself and for the world. Therefore, losing excessive time deciding to start is probably the number one issue why people don’t manage to achieve what they aspire to.
Don’t spend too much time overthinking about what you want to start. Just start it. Start it small, start it slow but start. That’s the key.
