In a blog post based on a talk given at a Wordpress meetup, Codeable.io CTO Tomaž Zaman adapts Agile to a single person with a series of tips he'd wished he'd used as a freelancer. Zaman advocates for splitting discreet tasks up into user stories.
A user story is basically a set of actions that someone or something (yes, the user can be non-human as well) has to take to achieve something. It's not necessarily a feature, as I'll describe shortly.
Thus allowing a more organized and communicative list of steps needed to complete a task on a project. An interesting point that Zaman makes is encouraging a step away from the estimate-by-the-hour freelance go-to:
Part of user stories is also estimating and there's one rule to follow: never, ever estimate by hours! Hours are evil because they don't take into consideration the uncertainty of development (you're nodding in agreement just now, right?).
Instead, he elaborates a fibonnacci system that allows for more flexibility and buffer time. Along with dailies with the client (short meetings) and sprints (which he defines as the period in which a major feature gets implemented), Kanban organization could majorly help freelancers organize and work more effectively.
Check out the original post for more detail.