Editing Advice

Keep in mind that Sonar doesn't mess with the recorded audio files, they're just _there_ and you can start over anytime. (Even on edits where you make "permanent" changes, the changes are automatically copies of the originals.) Also, there is undo, undo, undo, undo, undo. Works really well. Also, also, there is versioning in Sonar Preferences. You can have a "backup" of each stage of your editing work saved to disc. Eight versions, eighteen versions, whatever.
 
NAME your clips to help avoid confusion. When/if you split some of them during editing, NAME the splits. There's the ability to add notes to each clip too.
 
You can be a bit nervous, that's okay. Sonar (like a good DAW) is made for exactly what you are attempting, it will support you and forgive you when you mess up (as it has forgiven and supported a lot of forum members!). I advise, don't overthink it, just do it. The clips won't go anywhere (um, you DO have backups don't you? Anderton's law goes something like: A digital recording does not really exist until it exists in at least two locations.)
 
Also (I've used "also" a lot, mea culpa), don't be afraid to burn a couple of CDs of your work in the process, to take to the car/beach/friend's house and listen/learn from what you've done.
 
The great thing is that Sonar helps you avoid the few technical wrong ways to try to do what you want, and makes it easy for you to try the myriad right ways. (IE there is no single right way).