I purchased a Blade CP and seem to have a rotor head vibration problem. At 1/4 speed the head begins to vibrate and much beyond that the entire helicopter is shaking. Obviously I need to make adjustments but I'm not sure where to begin. This problem started 2 days after I first started learning how to fly and I've not tried yet to lift off but focusing on holding position while light on the skids. Any help would be greatly appriciated.