Lillebaby complete

I recently purchased a lillebaby complete but haven’t been able to use it as I can’t figure out how to get it on without help. I paid so much for it that I would really like to be able to use it. Any tips? The one time I did get it on with the help of my 7 year old son it didn’t feel right with my baby in it. She felt too low down and like her back was arched too much or something. It also seemed like she was struggling to breathe so I don’t think I had it adjusted right.