The obstacles between you and playing

An informal list of obstacles between a would-be player or GM and getting to a point where they can play for good:

1. Their own social awkwardness
2. The hardships of finding players
3. The complexity of organizing an event (time, space, etc.)
4. If the selected game is hard and full of crunchy rules, learning them, or getting to a point where their minimum subset is understood... at least by the GM