It's no big deal, just use the standard the Alberta bill of sale
http://www.foremostagencies.ca/sites...224226_bos.pdf
If you head down to an Autoplan ICBC broker to perform the transaction you might run into some serious headaches as the brokers might over complicate life not understanding that there is nothing unique to the process.
Just make sure the buyer is aware they will need to have the OOP completed, sign over the back of your Alberta registration, complete the bill of sale, and send the buyer on their way.