Hi Hubbard, I've only just seen this or I would have replied earlier. My DD was in a pavlik harness from 3-7 months. I know exactly how you are feeling. The first few days are a terrible shock. Rest assured that your LO is so young that it will not bother her at all - she doesn't know any different. And as Robino says DrCosy waves at Robino, even if it doesn't feel like it yet, you will get used to it - so much so that when it comes off your DD will probably feel all strange and floppy.
So ... advice. Well first, be reassured that when it goes on this early the pavlik has an incredibly high success rate. It worked for my DD, even though it went on a lot later as the problem wasn't picked up straight away. I think it delayed her walking a bit (she only started at 23 months) but apart from that you'd never know that she had one.
In terms of coping, yours will be on over summer, so you don't need to worry too much about keeping her warm. Just use oversized babygros (we bought a size up and then used them again when the harness came off!) Or you can get little dresses (again size up one size) and wear them with socks (and an oversized vest underneath. You won't be able to put any trousers or tights on her but as I say in summer that shouldn't be a problem. It's a bit rubbish that the hospital say you can't take it off. Can you ask them if you'd be allowed to go there once a week to have a bath under supervision? That's what our hospital did. And tbh by the last few weeks we had seen it be put on and off so many times we just started doing it ourselves (mark with pen where the straps were so you put it back on right).
As it's summer, you might find the harness rubs a bit so ask the hospital (or buy for yourself) some soft lint pads that you can tuck in to any places where you see it rubbing. We had them on the back of the legs and around the back iirc.
Changing nappies was a bit of a challnge at first, but we soon got used to it - it was just a case of threading the nappy through the straps.
Are you bf? If you are I can highly recommend a product called the "my brest friend". You can lie the baby on their back (ideal for harness) and just turn the head towards you. They are a bit expensive but you can get on ebay.
That's all I can think of at the moment. I know it's so hard when it first goes on but hopefully now it's been on a couple of days you'll be started to get used to it. If there's anything else you want to ask, just post (or PM me).
Take care and let us know how you get on.