I'm just beginning to gt confident with Liquid liner myself but I've discovered dotting it on and then sweeping it into a line with a brush is the best way for me. It controls how much you put on and you don't acidentally end up brushing it into your eye with that teeny little brush.
Blah reading it quickley never helps...Inner eye waterline i'd recommend pencil all the way! Even if it means retouching every so often. Especially if you have sensitive eyes.