Evan – as mentioned, backtiming is everything. I started as a musician and music editor, so I find that experience useful, but in the world of NLEs all you gotta do is start where you want to end, and work it from there.
Another trick or place to practice is editing the library tracks you’re using. When working with needle-drop material, I often find that massaging and editing the longer cuts gives me more to work with than just pulling the standard :30’s and :60’s off the shelf.
Downbeats and X-fades. have fun!