I don't think I have a very heavy flow so can easily get away with emptying once a day.
I guess when you first start using one, using a liner as well may be a good idea just in case there are leakages.
As for how far.. I don't really know..lol. you can feel it there so you don't have to put it in too far I guess. There a bunch of different folds you can use to insert too. You really need to discover one that works for you otherwise it's a horrible pain trying to get it in right.
They come in a bunch of different sizes, although if you've had children it's generally recommended you get a large one.
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