A good place to start :

https://www.lifepixel.com/tutorials/infrared-diy-tutorials

There are some YouTube videos out there, but I can’t vouch for them.

I was wondering what to do with my old Canon DSLR when I upgrade. Now I know. I love tearing things apart.

Edit: I researched this a little further. As much as I love to break things, the way to go is just pay the pros to do it right.