Anyone PAINTED wood trim?
If it hasn't been poly'd, you can re-stain the same or darker color
If it's been poly'd, you can use polystains or a gel stain (again, the same or darker)
Regardless, if you want to paint it's a coat of oil/alkyd primer and two coats paint or preferably enamel, water-based or oil/alkyd
If you have stain (w/ or w/o poly), and want it lighter, it's a full strip, and most likely more efficient to remove to re-trim, and go from there
So, depending on what you have and what you want, it could be slightly more labor intensive to re-paint
Also, depending on what you have and what you want, it may be your best alternative