Before i get started, would like to shout out a big THANK YOU to badboyscad, who was the inspiration behind this, and also was kind enough to answer all my queries, no matter how silly they were.
This being my first DIY, i wanted to get started with something which was relatively simple, before i ventured into something a little more challenging. I had initially planned to make my Pulsar as the whipping boy for my antics with LEDs, before starting out on my car, but ended up starting out on the car itself.
I managed to fix blue LEDs to the cabin light in my car. Steps explained below:
Gently remove the cabin light holder, by applying pressure to the regions as depicted by the arrows in the pic. I initially assumed it would be a difficult process to remove the holder, but its fairly simple in operation.
Once you remove the holder, you will find the translucent cover which is held by 4 clips to the holder. Push these inwards to remove the cover. Unfortnately, i didnt click any pics to show this step, but i can add this later.
Remove the cylindrical bulb, and keep safely just in case you ever feel like going back to it.
Connect the LEDs in series. I used 5mm Blue LEDs. To have a neater set-up you could solder the joints together, and add sleeves to the legs of the LED, but i chose to keep it rather simple for starters. The shorter leg is the cathode, while the longer leg is the anode.
Since i was using 3 LEDs in series, i chose not to use a resistor in this arrangement. I used a cardboard strip to form a base on which i taped down the LEDs using simple insulation tape. This keeps them from running all around the place. Connect the anode and cathode of the series arrangement to the appropriate ends in the holder, and you're good to go.
Turn on the light switch, and revel in the cool blue light.
P.S. I did not file the LEDs to obtain a uniform glow. I wanted them as bright as possible. As of now, since i have the LEDs pointing to only one direction in the casing, most of the light emitted from them are directed towards the passenger section. I plan on having another series set-up in parallel to this to get light to the driver's side as well.
I may even consider having white LEDs in future, which was my original choice.