If you're still finishing up the place, worth thinking about curtains earlier than you'd expect, not after the walls are already painted. Mounting height and rod placement are way easier to plan before furniture's in the room, and if you think you might want motorised curtains down the line, getting the wiring sorted now saves a proper headache later. Also leave enough wall space beside each window for the curtain to actually stack when it's open, easy to forget until it's too late. The same upholstery showroom in Gurgaon I mentioned earlier was happy to talk through this stuff before I'd even ordered anything, which was more useful than I expected going in.
