They also sell a tool for it on amazon: http://amzn.to/2eebBXh
If using a razor blade, cut softly and just enough to pull off the sheath. To see the difference of an RG6 and an RG59 coax, watch this:    • The difference between RG59 & RG6 coa...  
They also sell a tool for it on amazon: http://amzn.to/2eebBXh