I have been running my Fate based prototype game in a monthly RPG meetup for well over a year now. By the nature of the event, every game is a one shot, mostly with players of very different levels of RPG experience, who have not played together before.
The hardest part turns out to be the world and character creation phases. It is time consuming, especially for people without experience in Fate or each other. The limited amount of time we get is spent mostly for such things, so we end up with little time to run the actual game.
Pre-generating the world and characters does not work as a solution. It kills the essence of Fate games. Creating your own world is what makes Fate games special.
The solution I found is to start with a half-finished world and characters, and use declarations during the game to fill in the blanks.
If we put this into Fate Core terms (my game is different in a few ways), we start with only a couple of issues, and define only the High Concept and Trouble for the characters, plus their peak skill.
During the game, anyone may fill in any detail on their character sheet, provided they supply a backstory in a couple of sentences. This attempt is subject to compels based on the existing aspects of the character and the world(issues), but not any scene aspects, because it is more like a flashback.
For issues, we take a different approach. If you propose a new issue in game; Rule zero: if everybody likes it, then it is on. If anybody is against it, then we put in a vote (everybody's equal here). The player making the proposition sets the base "skill" at 0. Every other player can choose to give it a +1 or a -1. Then the proposer rolls the dice and adds the "skill". If the result is 0 or higher, then the issue is on. Otherwise, it is forgotten and not brought up again. This result is also subject to invocations of other issues, so players may attempt to influence the roll through the use of their fate points.
This approach has let me run enjoyable games in limited time with inexperienced participants, without losing the ability to let the players make their own world. Hope it helps you as well.