With the ergo-
-ergo fastened around waist with the LEFT shoulder strap loosely on left arm
- dd2 on my RIGHT hip
- stick RIGHT hip out as far as possible and lean a bit forward
-slide dd2 around onto my back, sticking my butt out as far as possible
(like I was going to give her a piggy back ride... butt out, leaning forward)
-make sure dd2's LEFT foot goes below the LEFT shoulder strap (not into the loop made by the strap)
-once dd2 is mostly on my back I hold her into my back with my LEFT arm while moving my RIGHT arm out of the way
-pull right arm strap up, stand up straight, jiggle dd2 to make sure she is in place
-attach chest strap and go!
It's easier than it sounds.... but I practiced a lot with dd2 over the bed or couch, and I practiced while sitting on the floor too. Good luck!