Coming from a D200, the first thing I would do is double the shutter speed.
The second thing is start working on your Hand Holding technique.
This camera will be no where as forgiving as one with 10 MP.
Higher resolution will show user error Mo Beta.
You may have to start out with a TriPod, then MonoPod, before hand held shooting.
The advanced AutoFocus and metering system will help and so will the faster processor.
Read the manual with the D7100 in hand, then practice.
The keeper rate on my D800 is now the best of any camera I have owned.
The D7100 should be just about as capable as a DX camera can be.

As for the manual, keep doing a Google search.
Europe usually releases a no-print version before the camera is for sale in the US.

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