I didn't convert it myself. I got it done through a camera service. If you are in the US you can use LifePixel:
They also explain the basic process here:
https://www.lifepixel.com/infrared-faq
Processing is covered here: https://www.lifepixel.com/tutorials
Much appreciated! Awesome stuff, had never heard of lifepixel!
UK based currently myself, and into doing stuff myself as opposed to paying a pro.
They have a tutorial for the Nikon D80 I'm familiar with, and which seems to go for less than £100 on eBay... Might pick one up in the coming months once I have a few quid spare and have a go, taking pictures of the process with the other camera :D
Cool didn't realise you were in the UK. If you aren't confident yourself these guys can do it for you here - they were recommended to me by a few people:
http://advancedcameraservices.co.uk/acs-digital-infra-red-photography/