Preventing gyno with clomid or nolvadex

Is using clomid everyday during and after a cycle that would include Dbol enough to prevent gyno or should I also use nolvadex? How would I use nolvadex if I also use clomid. I think I am prone to gyno so I want to take extra precautions. It will only be a 3 weeek cycle using Dbol and Anavar. Any advise please?