Don't know if it's been mentioned but I do this with my fins when entering. I have the spring straps which may help with this.. I put my wrist/arm through the strap so one fin is hanging on my arm. Then I carry the other one in that hand. When in deep enough water (hopefully past waves breaking) I first put on the one in my hand. While I'm doing that I make sure the one on my wrist doesn't have any "opening" to escape. I use both hands to put the first fin on, keeping the one on the wrist secure. Once the first one is on I can now put the other one on, again with both hands, so that one also is secure. I had lost a fin 3 times over the year and was very fortunate to have recovered them diving down with one fin only. This method seems fool proof to me. I do it even in glassy calm water to keep in the habit. Anyone else use this method?