Helicopter Stability

I have just finished building my HK 450 GT Pro. It is VERY difficult to hover!

How unstable are helis supposed to be without stability software?

The micro twin rotor cheepies seem so stable compared to the Cyclic 400 size.

Should a well setup heli be able to hover on trim alone?

 

I was hoping to get a good datum before installing the APM but may just install the APM to save wear and tear. I really didn't want the APM project to fail due to a bad heli setup.

Are there any good sites on how to really setup a heli?

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