I just did this last week to my 17" MBP. I used the Spyder Express and it work very well. It made a huge difference in the colors and removed the magenta-blue cast from the screen.
You just install the software and run it. You will put the reader over you screen (in a dark room!) and let it run. It took 5 or 10 min.
If you don't like what it did, you c an go back to the original color profile.
I do a lot of Photoshop editing and HIGHLY recommend it.