I'll be real with you - the road will be difficult. How difficult I cannot say because each individual is different. I was PMO for almost 10 years and didn't realize I had problems until I got my first girlfriend. Even then I just assumed she just wasn't getting me there (in a way it was true, but in no way did I tie it to porn).
A good start is just making it past 30 days. Some guys report significant changes in just the short time span of a month while others need 180 days+.
There is no real way to say, especially since I don't know the details of your issues. What I can definitely say however is that committing yourself to this project will vastly improve your self discipline - and all the benefits concerning no PMO will fall into place progressively over time.
Good luck brother!