Stack Exchange network consists of 182 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
Ask Different is a question and answer site for power users of Apple hardware and software. It only takes a minute to sign up.
Q&A for work
Connect and share knowledge within a single location that is structured and easy to search.
And what are things to watch out for based on previous upgrades?
No, the Lion upgrade will only affect the partitioned part of your hard drive housing Mac OS.
It will also install a small partition housing, basically, the installer of Mac OS. This is so that if your installation ever fails or something like that you can always reinstall.