Whistle - I'm mostly referring to the giant slalom version of skiing and mostly mid corner. Not specifically turn entry or exit as such, although they do tend to lead with the inside "bar" .
WRT transition, "I" tend to throw the bike back and forth between my legs with my legs. When the bike is in the center, I tend to have both knees on the tank (errr, uh, the frame I suppose on a conventional type of bike ) when it's upright between corners and as I add lean angle I hang off. This is only for right/left flicks between two sharp corners. Coming into a corner from a straight I hang off before turn in. I try to hang off before I get on the brakes, but someimes that's not the way it goes so I hang off while braking. I try to exert as little pressure on the bike itself as I can, and mostly it's a combination of throwing myself to the inside while driving the bike to the outside. I'm probably not as smooth with it as I should be, but it "seems" to work .