A:AnswerI think you're doing it right - especially in terms of this particular grinder as the lid on the bean hopper is anything BUT airtight and would therefore definitely lessen the shelf life/freshness of the beans.
A:AnswerThe top unit which holds the beans isn't removeable. You twist it using a pointer in the middle of the grinder to control the amount of grind on the beans. With the top, the unit is around 11 inches tall.
A:AnswerI use the selector at 10 cups on one of the mid-espresso grind settings. This provides around 3-4 2-shot baskets of grind (a couple days for me). At this rate, the hopper holds around a week's worth of beans.