rccrazedman is correct. Helicopters just don't hover by them selves. You may be able to get a hands off hover for a short period of time, but you will eventually need to correct it.

One of the biggest reasons just about all helicopters drift is because they have tail rotors. The tail rotor pushes the helicopter to the side as it tries to counter the main blade torque. This can be alleviated somewhat by counter-trimming the swashplate, but it can't be fully cured. The only way of fixing it, is by training your thumbs. [8D]

If you can hover and fly the helicopter around proficently in G3, you're probably ready for the real deal. A simulator, no matter how good, can't really prepare you for the real thing. Some people find the real thing easier, some harder. The point is, gaining real experience with your helicopter is the best way to learn. Not to say the simulator isn't good, becuase it definately is, but it should be used as a compliment to your growing real life skills, instead of trying to learn completely on the sim.