I have experienced the same thing, I would SLOWLY increase rotor speed and the heli would go forward and to the left. This is my first heli also (Lots of learning to be done) I figured the uncontrollable sliding across the floor was normal and I needed more practice. I have leared two things since then- last week- ground effect causes a lot of control problems when the heli is a couple of inches off the floor and second is indeed practice. When I got up the nerve to throttle up a bit more and get a couple of feet in the air it calmed down a lot. I still wanders around a bit but as I get even more comfortable that will pass also. Can't wait until I can nose in hover.