I used to attach it to the door and then take the harness bit of the bar, sit ds on my lap and feed his legs into it like putting on a pair of shorts and then pick him up by the straps and attach back onto the bar. Hope that makes sense.
Laid dd/ds on the sofa, and pulled the seat bit of the bouncer up round them like a pair of pants.
Then transported the whole lot over to the door and then hung it up with the dc already insitu.
Dd in particular loved it and would happily boing away for 30 minutes at a time. It transformed my life, iirc, because I could then prepare a meal in that time, with her bouncing away happily in the kitchen doorway .
Your thread title is funny... The first thing that went through my head was 'she can't mean she wants to hide her in her handbag?'. I do exactly the same as Casmama but it is a faff! My DS is also long/tall and I always bang his head on the bar. Incidentally, if your DD likes it now, just wait until she can actually bounce! DS is 7 months and bounces like mad... We end up with a huge pool of droolonthe floor though!