Mine just came in last night. I took a look at it. It came in a tube and there are 4 pieces of tint on a sheet of paper (all tail light shaped). Why is there 4? And btw... the instructions that came with it are not very helpful - at least imo. If someone can explain the steps (especially to avoid wrinkles, etc), that would be much aprpeciated.

Why are there four?
Because your head lights are split into 2 sections. Look close, you will see. I had the same thought when I got them. Just open the hatch and you will see one part opens with it and one stays.

I found the instructions easy to follow. Don't worry about wrinkles, as long as you spray the parts (light and both sides of the film) with a soapy solution (e.g. 1 spray bottle full of water with a few drops of dish soap) you can always reposition it.
The film is actually really stretchy so it will fit around corners very well.
Just make sure it is a warm day when you apply it. The warmer, the better. Make sure you have a small squeegee before you start. I had one from a previous project. Something like 3-4 inches wide works best. Mine came from the Hardwarestore; I bought a window film installer set (~$7-8) when I installed window film on one of the windows in my house.

Make sure the lens is very clean. I used rubbing alcohol to clean it.

Start at one corner and work your way down. To make sure you can stretch it, squeegee one or two inches of the film real good and then pull. It is unbelievable how good it holds on to the plastic lens. If you mess up, gentle pull it of, spray it again and place it.

Good luck

Thanks a lot for the detailed instruction. I feel more reassured i can do this without messing up! Will post pictures when finished!

Am I wrong or is there still a small line of red on the tail light that did not get covered by the tint??

Not if you do it right, i have no noticable line and people that look at it think i replaced the entire light.

From your pictures, I'm seeing a thin line of red between the blinker (clear portion) and the tint. Can you take a close up picture on that area?

That's what I was talking about...

Yes, there is actually a bit, but you could pull it up higher. It is not really that much visible. It also depends how the light falls.
I guess I could have done a better job.:dunno:

once its there lets say for at least 1 - 2 months, how easy can i remove it? (in case i will trade in my e53)

i would assume pretty easily, much like window tint?