Assuming you are thus equipped, and have time in hand...
(1) Open door, jump, pull cord once clear.
(2) Shut down engine, reduce speed to just above stall, pull BRS handle.
Incidentally, exactly what do you say in your Mayday call if you've just pulled the handle, are coming down still in the aircraft with several POB - I'm not aware of any standard phraseology for this.
G