I just got my new set of kenchii shears today and I started trimming my 4 month old spoo but it seems that the curves are pinching her or pulling on her hair. I've tried adjusting the little knob in both directions but it is still bothering her. She quickly turns around and nips herself like she's been bitten. was I supposed to do something with the shears to prepare them where they are brand new? I don't know what I am doing and I am new to grooming. Please help me figure this out.