Oxycodone addiction?

How do i quit taking it without withdrawls? I have been taking percocet, and now oxycodone for a year and a half...I DONT want the withdrawls,,,,,I know gradually taper off, but its hard,,,I do have alot of pain in my back, I have 2 herniated disks and a slipped disk,and, i have Degenerative disk disease,,,I just dont want to have to take it the rest of my life,,,,Any suggestions? Thanks