i have done a Canon EOS 600D
It is a very easy thing to do if you have the patience and go slowly.
You need to cut one of the UV filter out and replace it with glass, this turns a few people away for it right there.
But if happy to give it a go, you need the glass which can be purchased through Astronomik
https://www.astronomik.com/en/photog...ification.html
The instructions on how to go about the whole procedure can also be found here:
http://dslrmodifications.com/rebelmod450d1.html
But generally once it has been modified it is really only to be any good for Asrto work.
You can use it for normal work, but you have the cost of adding flitters and the you still won't be back to how it was before the modification.