I believe in my self rescue abilities because I have practiced them in rough conditions. However, I always prepare for being in a situation if my self rescue fails.
On a side note - When I started kayaking I thought of rolling as a rescue. After being involved with whitewater and surf kayaking I no longer think of rolling as a rescue. Now I think of rolling as a maneuver, like a low brace turn, bow rudder, forward stroke, etc.