The key is to intercept lustful thoughts, including thoughts of MZL, early. Don't give them a seat in your brain. Keep away from movies and TV, and guard your eyes on the street, in mainstream newspapers and mags, and on "clean" sites on the web. Put your hand over any pictures of females immediately, before you look at them.
That's your hishtadlus. Turn the rest over to Hashem. Try this tefila:
"Ribbono Shel Olam, I am powerless over lust and my life has become unmanageable.
Only You can restore me to sanity.
I turn my life and my lust over to Your care and ask You to please heal me from this illness of lust. I don't want to lust, I only want You and a relationship with You and Your Torah.
Take it one test at a time. One right decision at a time.
Keep at it. If you are persistent, and honestly want to give up lust, it will happen for you.
Hatzlacha,
Alex