Putting on the led bulbs are very easy. The real pain in the butt is with the wiring if you want it to look clean and factory look.
BE CAREFUL WHEN WORKING WITH ELECTRICAL ACTIVITIES, MAKE SURE YOU DO NOT SHORT ANYTHING!!!!!!! TAKE THE NECESSARY STEPS TO ENSURE THAT ANY EXPOSED WIRING OR TERMINAL ARE COVERED WHEN NOT BEING WORKED ON!
1st step is to acquire the 3mm pre-wired led diodes (should also be waterproof) with 12v rating for your colour choice (common ones are white, red, blue, purple, green, ice blue, etc)
2nd step is to understand how to open the door panels
3rd step is to understand how to open the door handles
4th step is to be able to correctly identify wiring or wire colours
Once you know how to do these, the struggle begins.....
Go ahead and open the door panels and remove the panel from the car completely or you will have difficulty accessing the area you need to work on (repeat for all remianing doors when you're done)
Then identify which wire actually is used for the puddle lamp which is the one that lights up at the bottom of your side view mirror (in case you don't have this feature, you need to think of where you want the power to be tapped from). No need to cut the wire, simply splice and tap into it. Do not worry about the ground or negative. I am sorry I don't remember the wire colours and I don't have any photos to show you. Even if I did, and your car has a different wire colour code, it might compromise the work for you, so for better or worse, this is probably better without specifics.
Run the wire through the rubber covering for the rear doors via the floor of the car (need to remove more panels here, specifially the sill) and make sure you can get the wire through for the rear door. This activity took me like a good 4 hours or more. However if you took the time to do this, the car will look clean and free from wires. You can skip this step and just run wires through the body if you want to, but i don't suggest it.
Next step is to solder or connect your led diode to the wire you just pulled. You actually only need the + or positive or most commonly used colour is red. The negative or black ones you can just fasten it to any metal body part in your door frame.
Once that is done, carefully look at the door handle you just removed, there should be a rubber part that cushions the door handles from the door body. This is where you would want to put the led diode (put them at the long handle and not the short part that is used to fasten the door handles. It may be that you need to sand off the 3mm led diode so that it is flat on 2 sides to reduce any bulging and make the fit much better. Be careful not to destroy the diodes when sanding it down.
Having done all those, you're basically good to go. Test it and if it works, put everything back and you should be good to go.
If you wired everything properly, the light will go and and off and is dimmed with exact timing as the puddle lights. No drilling, no customisation and if you decide to get rid of it, just take out the diodes and make sure you cover every exposed wire very very properly. There is no need to pull any wire that you ran through the rubber coverings so it should be much easier if you don't want this anymore.
Some friends have asked me to do this for them and I did tell them, not in a million years simply because it is just a lot of hell i had to go through to get the wiring done. Installing the diodes themselves were actually super easy.
Good luck and let me know if you have any questions. Will try and guide as much as possible.