Advice
I would say work smart than hard. Majority of the time, as a video editor who is starting out, I would find a style and stick with it throughout your time with them. Also, if you're the type of person to do so, you can experiment different style edits whenever you get used to their schedule and your own routine.
For voiceovers, I would not force anything that's out of your comfort zone, let that build-up overtime. When you find a range you're comfortable with doing your voiceovers, just keep going with it.