Ummm. It shouldn't be that hard. I think I might have to say this is a result of a poor transmitter. What kind is it? it may be to sensitive. See if there is a way to tone down the control sensitivities in the Sim. Use very light control movement on the transmitter ( that parts normal). If you really want to get into helis, you might want to step up and get a better sim maybe. I use RealFlight. works great. Or Pheonix.
On a side note, that left bank on lift off is a resuld of the tail rotor. You may notice while hovering, your heli will naturaly lean right to counter act it. You will only notice it on lift off because you heli is level.
Its practice practice practice!!! Hovering is the hardest step to learn and it should be fun learning. A great tool for me if RADD's School of Rotory Flight. Read the Flying > How to Hover section. Does WONDERS!!!!!
http://www.dream-models.com/eco/flying-index.html
Another good site is:
http://www.rchelicopterfun.com/index.html
Good luck and stick with it!