A man who is a woman's guardian and wants to marry her: what he should do

Al-Rukayn (may Allah have mercy on him) said: Sayyiduna al-Mughirah bin Shu'bah (may Allah be pleased with him) was the guardian of a woman, and he wished to propose marriage to her; with him there were some other guardians of that woman as well. He ordered one of the guardians to marry him to that woman.

Al-Hasan (may Allah have mercy on him) said: If a woman's guardian intends to marry her himself, with her permission, then he should appoint a man as guardian over her affair, and then marry her in the presence of upright witnesses.