Arm out the window and Ascend Charlie have the answer - Hover Attitude! The trick is identifying it and then correcting immediately it starts to wander from where you want it to be. Imagine correcting a painting that is hanging on a wall - you can be incredibly precise in getting it level visually and it is that level of precision that you need to develop selecting and maintaining your hover attitude. Unfortunately for the painting analogy, in the hover you want your picture of the world to sit at an angle to its frame (cockpit canopy, supports and coaming) but the concept remains the same.
All the information you need to hover well is out in front of you and the sooner you grasp the concept of hover attitude the sooner you will hover well. The brain is a fantastic machine for processing information you just need to look in the right place for that information.