Lillebaby carrier help

Jamie
I have a LilleBaby, and it's been challenging to get it adjusted correctly. This is the first time he's been content in it, so makes me feel he's comfortable. But he still feels likes he's sliding down & I really can't sit down. I did roll up a blanket as a "booster". I watched videos but they make it look so easy.
Anyone have experience with Lille Baby carriers and can give some pointers? Does it look like I'm at least close to figuring this out?!