Convert i3 direct drive extruder to Bowden?

[Kingoddball]

I've decided to upgrade my i3 again.
I am think I want to change the extruder from direct drive to a Bowden.

Has anyone done this? I'm after some help or info?
My nozzle is a J-Head.

Frame is a steel plate/wooden style if that makes any difference.

Just after some points or info if anyone has any?

Never used a Bowden so this is new to me, seems like it will be a fun new challenge, especially with the software and retraction issues.

Speed increase will be great!

Edit: Some software help for anyone else: http://slic3r.org/blog/tip-bowden-extruders