This is one of those home topics where the obvious approach isn't always the right one. A better starting place is orientation.
Orientation
Orientation is worth doing deliberately rather than defaulting to whatever's easiest in the moment. The difference shows up over weeks, not on day one.
Window treatments
Start by thinking about window treatments. It's easy to skip this step and go straight to buying something, but the households that end up happiest with the result usually spend a little time here first.
Arranging furniture to use daylight well
Arranging furniture to use daylight well matters more than it might seem at first. Getting this part right tends to save a second round of changes later.
Expert tip
Write down what isn't working before you start changing anything. It's easy to lose track of the original problem once new options are on the table.
Frequently asked questions
How long does this usually take to get right?
It depends on the size of the space and how much you're changing at once, but most households see the biggest improvement from the first few adjustments rather than from doing everything at once.
What's the most common mistake people make here?
Skipping the planning step and going straight to a purchase or a big rearrangement, then having to undo part of it once the practical issues show up.
Does this apply to rented homes as well as owned ones?
Most of the ideas here don't require permanent changes, so they translate reasonably well to a rental, though it's worth checking your lease before anything involving drilling or fixed installation.