The phrase "at first hand" means experiencing something personally or directly. Some synonyms that convey the same meaning include "directly", "personally", "immediately", and "first-person perspective". Other synonyms that are related to this expression include "first-hand experience", "first-person account", and "first-hand knowledge". These words all suggest that the information or knowledge being shared was obtained directly or personally, rather than through hearsay or second-hand sources. People may use these synonyms interchangeably depending on the context in which they are speaking or writing, but they all express the idea of obtaining information through direct experience or interaction.