Now you are going to have to turn both sides of the opening. But once you have the one side turned you can just stick a finger into the other side and push it up inside.
Then take your scissors tip or a turning tool and smooth the edges out as much as possible so it goes back into the wing shape. This is where the clipping in the hollows will help. If you get some pulling inbetween the hills you can ease that by turning it wrong side out again and clipping if you didn't already do that. I didn't clip this time and it was ok. So it is up to you.