I just (like 2 nights ago) threw out the directions to mine...
For the retaining clip - I think I remember using a screwdriver to catch the edge of it and pull it off.
I did the swap in the parking lot at my gym while waiting for my workout partner to show up... should take about 10-20 minutes tops.
As far as the centering spring goes - I kept mine in... I like the fact that it lines it up perfectly for 3rd and 4th without having to think... especially since I let my wife drive the car occasionally and she is still learning how to drive a manual...
