Default dang on mk4..

Had to take my phone to sprint they flashed and installed mk4... dang it's not as easy to root I see. I'm reading a bunch of many different root methods. Who can help here. Do I flash a custom recover then pull battery do I use android utility tool? I know we have a new way to get rid of Knox once rooted and recovery installed but how do I get there. Can i use the skipsoft tool kit to install a custom recovery without root and then just flash or do i need root to flash that program. im just making sure i have everythihng down before i attempt this end up tripping the counter and be stuck with a phone i cant return because i used an out dated root method