Definitely try to do the bathroom before you have to move in. We are currently in to week four of a five day bathroom job! Our plumber removed everything then discovered what a botch job the previous owners had done (think rotting walls behind wrongly fitted tiles). So we have had to get new tiles we didn't expect (we hoped just to fit new bath suite), fit in a tiler, and of course the plumber now has to fit us in between other jobs rather than doing it all in one week. Fortunately we have another toilet and an en suite, but I hate having DS trapping through!
Ikea kitchens are great, I exDP and I self-fitted one in my last house in 2000, sold the house in 2014, it still looked like new, and was still being sold if the new owners needed any spares. But I would avoid wooden work surfaces. They look lovely, but do need regular oiling, and I could never quite keep up with it behind the taps.
With painting, spend most of your time on prep - rubbing down, wiping down, masking up, the painting itself is relatively quick, esp white emulsion. And as PPs have said, a really strong, moveable working light is indispensable, all that white will send you snow-blind and you will miss bits if you haven't got a good light.
And finally, when DS was younger, we went for good underlay, cheap carpet, professional fitting. You only need do the underlay once, but professionally fitted cheap carpet will look good for a couple of years and you won't resent the sticky fingers - I'm talking off the roll at £5.99 /sqm and replacing every three or four years. Now he is an older teen, I'm happy to spend for quality, lasting carpet. Kind of the same for bathroom tiles, cheaper tiles, professionally fitted.