How to convert non-JAA FI to JAA FI

[v6g]

What is the process of converting a non-JAA (specifically, in my case: Canadian) instructor rating to a JAA one?

I fully understand the process of converting the CPL to a JAA fATPL but cannot find out how to convert the instructor rating.

Any ideas? Has anybody on here completed this process? Or do I have to do all the training over again.

Does the number of hours spent instructing have any effect on the process?

Thanks all.