1. I usually do a dry fit first to make sure everything is going to work.
2. Then, I degrease all parts and threads with alcohol or degreaser.
3. When I install mounts, I put purple loctite on my mount screws, even the Torx screws that say it isn't necessary.
4. After bottom rings are installed, I place the scope in the bottom rings and make sure everthing is squared up correctly and that the scope is sitting properly in the rings. Any necessary adjustments are made.
5. I lightly attach the top rings, allowing enough play for the scope to slide in the rings.
6. I adjust for eye relief (on the highest magnification) and tighten the top rings just enough to hold the scope in place.
7. Then I use this little gadget for aligning crosshairs, loosening the top rings to allow the scope to turn if necessary.
http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=360476 This thingamabob aligns the scope relative to the mounts/rifle, so you don't have to worry about having the rifle sitting perfectly plum.
(FWIW, I saw this system at Midway as well. Don't know much about it though. I see some complaints of weak magnets in the reviews.
http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=529349)
8. I snug down the top rings/ring screws in an even manner and then wipe off all the fingerprints with a little CLP.
9. From there, I take care of boresighting with the old fashioned "eyeball it" method. I use a gunsmith's rifle station and my neighbor's white mailbox post, which is about 75 yards down the road.
I just bought a set of the Talley Lightweights and like their simplicity. Nothing to report yet on durability.