The help file is very in depth, there are good tutorials on [Autodesk Subscription|http://www.autodesk.com/subscriptionl
You can also find good classes at [AU Online|http://au.autodesk.com/?extrafield=ms_descr
To ensure your models are aligned I highly suggest seeing the BYU tutorial. http://cmfac.groups.et.byu.net/miller/cm411/help/n
please check out some of the tutorials that I compiled.
Quick start tutorial on Navisworks http://bit.ly/wjv8ZQ
Clash Detective http://bit.ly/wsXkHG
Navisworks Tutorials - 4D Timeliner http://bit.ly/GGvhhM
“What we do for ourselves dies with us. What we do for others and the world remains and is immortal.” - Albert Pine