Are the chances really great the the plane would do a sudden quick about face or flip over because it tilted slightly and the engine(s) on one side started scooping water?

How much time do the passengers have before enough water seeps into the baggage compartment and the plane itself sinks?

Wouldn't there have to be trained personnel on each life raft to disconnect it from the plane before the plane sinks, dragging the raft(s) down with it?