I would prioritise, as others have said, the things that are most important to do before you move in.
Ie: the basics of: are you happy with wiring, heating and plumbing through the house, as all these should be done before you get your dream floors? Also better to do any wiring/plumbing/heating upgrades before painting so any plaster can be repaired.
Also think about if there is any old wallpaper that needs removed - are you happy with ceilings etc? Get any repairs done so plaster can be touched up as it is very very dusty and messy.
Then get your floors done.
You may well need drawings done for moving door into en suite - don't forget that if it's a load bearing wall, you'll need to have buildings control (local council) sign it off. Find a local architect OR architectural technician, read reviews, see if they have a presence on social media (not that it matters that they're good with social media, but the great ones in my area all post photos of projects on insta and fb and have lots of authentic reviews) and email them to ask them about your project (do they have time, have they done this type of thing before, what would they suggest).
Find a builder and line up all your tradesmen. Again, the local fb mums group in our county has always got great suggestions.
If you have two bathrooms then that is actually easier to do when you move in. If you wanted to say e.g. refinish a wooden floor, that would be a nightmare to do after you've moved unless you have lots of rooms/not very much stuff.
I'm not an expert but have done up several houses and moved several times! Interested to hear others' tips as well as we are thinking of moving into our biggest project yet!