I also use my right hand more than my left for shifting either lever.

1. Sometimes.
2. No.
3. Yes.
4. Generally I don't either.
5.

As mentioned above, with practice it will become 2nd nature. My levers are pretty much right where my hand drops straight down, so no need to look. I'll also second the advice that the lever tension should be tight enough to not slip, but not so tight that there is any binding, etc.