I dont know how you could mess this up. You remove the old suspension, and just slide these babies in.
More information on the noises. When do you hear the noises? When you go over speed bumps or pull up a driveway? Is it more pronounced if you go slowly up a driveway? Is it a creaking noise? or metal to metal grinding?
If its a creaking, its probably your upper control arm bushings. If it sounds like you just bottomed out, its probably the UCA's hitting the strut tower.