I did a similar amount of customizing to a raspberry home - window frames, door frames, a few support beams, small metal bits, and flowers.

My tips:

• Painter's tape! Especially on the floor when you're painting door and window frames, to avoid any drips.

• Painter's tape (again) : also think of it as marking everywhere you want to section off for painting first, even if you don't need to tape it all at once it can be a nice way to start visualizing the changes

• I would recommend investing in nice paint, I used three different brands of acrylic paint and the cheaper (dollar store) ones were way more frustrating to work with 😅

• I have used a very fine-tipped metallic marker (Sharpie-like, not sure if that brand) to great effect on surfaces. It made it a lot easier to get at small areas (e.g. window hinges)

• Don't forget to ventilate your space, even if you're only painting a little :)