[update... Todd Kopriva added links for: details of placing layers in time, guide layers, selecting layers, and changing layer stacking order.]
- Option Paste for Current Time
- Convert Footage to Layers
- Replace Source
- Guide Layers
- Scroll Layer to Top
For similar recent efforts, see After Effects Leftovers: 40 tips better the next day, A few quick tips for After Effects, and Keyboard shortcuts you (maybe) don't use.