It's up to you but I did mine really early with my first and ended up with wrinkles so had to talk everything out wash and re iron everything closer to the time and ended up with way to much as I kept adding to it definitely leaving it a bit later this time xx
There is no set rule Hun, you do what you like when you like. I'm over organised also and have everything ready super early. It's excited x
I packed mine at 36 weeks but it's up to you when you pack it, you can always unpack and repack as and when you want aswell xx
I'm 26 weeks and haven't even given it a thought when is the best time to start?xxxx