I find it extremely difficult to control my haraam gazes.

Answer

Reflect on the hot rods which will be inserted into the eyes as the punishment for haraam gazes. Rasulullah (Sallallahu alayhi wasallam) mentioned the hot-rod punishment. Therefore, when your nafs desires to cast a haraam gaze, immediately think about the hot rods. Also reflect on the Presence of the two Recording Angels at your side, and on the Presence of Allah Ta'ala looking at you.