I highly reccomend practicing wet re-entry. I practice at a friends pool and out on a lake every once in a while so if it happens anytime I know I can recover from it.
I did flip when I first started on the ocean, I was fishing out of Malibu and was turned around trying to pull something out of my tank well. I had my back turned on the ocean and a swell just hit me at the right time when my balance was off and I wend into the drink. The day after I began using rod leashes