Jane,
I learned FCP in 2003 before more recently Avid, and now my Avid professional experience has cross-pollenated how I work in FCP. My keyboard arrangement is even Avid style because frankly it’s a WAY more efficient style to work. Rather than giving you a RTFM response that can often pervades the cow, I will make these practical solutions to a VERY VALID way of working:
Customize your keyboard so that your V and B keys are “Insert sequence content” and “overwrite sequence content” respectively rather than the troublesome FCP defaults. When you cut with your sequence in source side it will cut in the material rather than a nested sequence.
Another way of working that no one ever mentions on these threads is to have your selects timeline open above your record timeline (having more than one timeline open at the same time is a great feature of FCP.) You should even have your selects Canvas viewer open in a separate canvas, tabbed together, same as your sequences tabbed. Basically now you will have 3 groups of viewers. One source, one tab of selects timelines, and one record. I mark an In and Out on my selects sequence, hit option A (for select in to out), copy and paste. There are two useful pastes: overwrite paste (command v) or insert paste (shift v).
Until FCP adds proper timeline to timeline editing (which I have a good feeling is in the next version) this will have to be your workaround. Email me if you want my keyboard settings and I’ll send them to you.