Congrats on the new bun!
We just picked up an unaltered doe (rex broken blue). She is 6 months old and has spent her whole life in a barn in a cage. We slowly transitioned her to being with our other neutered male rex and after a week they stopped beating each other up and are bonded. She has the run of the house for about 2 hours each evening and otherwise they both live on the porch "free range". She transitions just fine.
My suggestion is:
Make sure there are no wires where the bun can get to, they think they are vines that need trimming.
On hardwood floors, they are going to be super scared. They need to learn how to walk on the slick surface. It will take about a week to fully adjust. Make sure there is a liter box inside for the time it is inside. Otherwise it will pee on your couch or other soft surfaces. Be careful of shoes, they liek to chew the edges (sandals are my buns favorites.)
I think that they will adjust just fine to being in the house.
When left alone you will also notice that their personality really starts to open up.
Flemish giants tend to be rather quiet buns, so it should make things easier. If you want to keep them out of certain areas, concider animal gates/fences. Just remember that buns can jump most gates, you might need to use two stacked on top of each other. They also tend to chew the plastic gates trying to make a hole. I put wire mesh on mine, what works like a charm.
If you have any questions, please feel free to ask, I love to help with getting buns in the house, and also with bonding rabbits.
Glad to help!
