It does look fiddly but honestly, once you do it a few times it's easy.

I have one that I used for DS and I used to tie it on before we left the house. That way I could just get him out of the car and pop him in. Because it's a soft, unstructured carrier you can drive etc. with it on just fine.

I don't use mine any more so I loan it to my mamas with newborns and they have all loved it. And they work with any sized mama I think they come in two sizes (one is longer) if you're worried.