1. Not staying single [Igros Moshe] – start looking at the age chazal tell you to, it will be easier
2. Not seeing the things that are ossur to see [ohr hachaim hakadosh Acharei Mos]
3. Not thinking the things that aere ossur [ohr hachaim hakadosh Acharei Mos]
4. Not spending too much time in ones own company
5. Akshonus [maseh Rav]
6. not giving in [Succa 52b]
7. learning Mussar and especially about these topics
8. Understanding that ultimate control needs much tefila and syata dishmaya
It is hard to elaborate more, it very much depends on the temperament of the individual, and on how much he has already steeped into the yetzer horah.