If you plan on shooting the same Brand bullet in your rifle, cleaning is a snap. Many folks recommend breaking in the barrel by; Cleaning before the barrel is ever shot, with a good solvent, and starting with a green barrel. The NEF needs to be broken down and cleaned from all the crap that seems to be on them from the factory, around the hinge pin. Follow cleaning instruction on your Cleaning kit. I would say clean from the breech when ever possible. Shoot 5 rounds clean the bore, shoot 5 more clean the bore, repeat this for 1 full box of ammo. When the first box is gone, clean it one more time, always cleaning from the breech end. The next box you shoot should be the same brand, and the barrel sould be conditioned for that particular jacketed bullet. Cleaning now only need to be done if accuracy is not good. NEF rifles are somewhat finicky but seem to perform well if you don't jump around with ammo brands. Hopefully you can find a brand that shoots well from the start. I highly recommend the winchester silvertips, and the Remington SP core-loks.
Cleaning is an easy job with a Bore-snake. (Sold at most gun shops)
Good luck
vance