Remove the grips. Holding the gun horizontally, sideplate up, tap on the frame with a piece of plastic or wood, until the sideplate is completely free of the frame, rattling as it bounces up and down on the frame. Do NOT, under any circumstances, pry the sideplate from the frame.
Conduct further disassembly inside a plastic bag. IIRC, the flying spring you have to worry about most is the one behind the bolt (cylinder lock) actuated by the thumb piece.
See Kuhnhausen for further details.