I think this is the easiest way to do the front dome lights. Just swap the red to the black when you plug things in and test it out. If that doesn't work, plug red to red and black to black. Get a few small zip ties to secure the panel in place because there is no good spot for the adhesive backing to stay stuck to. I looped the zip tie around the lightbulb connector piece.
There's an old write-up that requires disassembling of an LED bulb:
http://www.nicoclub.com/archives/dome-l ... 5-m56.html
Using a panel that allows you to swap the wires is definitely much easier.
For the rear passengers, I just purchased LED bulbs and put them in. They're a direct replacement, I'm pretty sure they re the 3175 bulbs. Again, if you install them and they don't turn on, flip the ends around and see if that works.
I swapped just about all of my interior lights to LEDs bought from ebay, even both vanity mirrors. The only ones I didn't bother with were: hardly noticeable light in driver's side foot well and glove box (if there is even one there).