anyone have tips on using titanium backup?
Sure...
Titanium Backup requires you to be rooted in order to use it. For full features and functionality, buy the app and get the key for it.
When you are ready to back up, you have a couple options:
Click on the Backup/Restore tab (at the top, in the middle of the 2 other tabs). Press your soft key Menu button and click on Batch.
You will then see a big list of options. The most vital ones are the backup of all user apps and/or all system data. I choose to use "Backup all user apps + system data." Click on the button RUN.
This helps save everything when you are flashing ROMs, or anything else for that matter. When you are done flashing and getting settled down to putting apps back on or whatever it is in your interest, you can go back to Titanium and go back to the Backup/Restore, push soft Menu key, click on Batch, scroll down to the options of Restore missing apps and/or all system data to restore anything that isn't back in place.
Other tips:
Some people like to install themed apps (APKs) for Google Search, or the Market, or Pandora, etc. Some of us use the option to Freeze these apps from updating. I only use the Freeze option for update.zip to prevent it from updating the Market and other stuff otherwise I will lose that themed APK or something might go wrong and it won't work.
It's best to explore each setting, learn and understand their functionality and what they do and how you benefit from it.