I always found that inverted entries always seemed to work best for the crazy stuff with the Rookie II. The hover isn't really a hover but more of an inverted slowly descending harrier.

Lot of ways to enter it but I liked an inverted push up to near vertical, or a hard climb rolling to inverted, and as the airplane appears to be about to stall or run out of speed, hold full down elevator & full power and the airplane will usually end up hanging there at about 80-85 degrees nose up, inverted. Thrust vector needs to be on. As it slowly descends, you can use the rudders to steer it around. Recovery is a sharp pull on the stick to full down and you're out of it, nose straight down and needing a 100 feet or so to get to level.

You'll have to try it and find the right technique for your airplane & engine. It will flip out of it if you don't hit it at the right speed or right attitude.

Never found a way to hold it in while upright. If you are able to get it into the "hover" without thrust vectoring, you may not be able to get out without turning it on.

You can fly it around flat, upright or inverted while slow and do some interesting things using the rudders at low speed. The airplane spins nicely upright and inverted (cross controlled). You can accelerate the spins by easing the elevator off the stop towards neutral. Don't be afraid to try anything at low to moderate speeds, just have enough altitude to recover.

If you also have yaw vectoring, you can get it to do flat pinwheels at incredible rotation rates.