1- You list it
2- When someone buys it, you receive the full payment (EMT, money order, whatever).
3- You get the name and RPAL # of the buyer
4- You call the CFO and initiate the transfer, you then give the transaction code to the buyer so he calls the CFO and completes the transaction.
5- When you receive your letter from the CFO, the firearm is no longer legally yours so you can post it using Canada Post Expedited with signature and ID verification.
6*- I've sold firearms only once, and after a while I did receive an ATT, not sure if it is needed to transport it to the post-office... I never waited for it nor did I knew I would receive one :S I would think it is needed if I wanted to deliver it in person?