Get a good shocky, a epp one if neccessary, then visit www.blaineaustin.com, www.teamflyingcirkus.com video page, and www.3drc.info manouvres section, and practise all those manouvres in the order that you feel you can accomplish them.

I started off with flat spins and hovering, then inverted flat spins, then HAKE(high alpha knife edge), walls and parachutes, then blenders, then whatever felt good at the time.

Where is the balance on your Showtime, further back sounds like a good idea, I just moved it back on my EF Edge and the harriers and hanging have got easier. Next time out I'll move it further and see if that helps more. Also, are you using full up ele to harrier? In the vids I've seen the showtime does a very nice at a not too high angle with only a little power on, I'll see if I can find the link.

EDIT: found it http://www.teamlawndart.com/Video/ShowTime2ndFlight.wmv

Getting into the harrier, slow the plane down by gently adding a little ele, and as the nose comes up adjust power to support the model in the nose high attitude. To maintain, I use rudder for turns, and aileron to hold the wing level, once the wing starts really rocking give it power and recover to height, before trying again. Exiting a stable hover is simply reduce the ele. and if need be add some power.

Hope that helps