According to Jason Pack, the most effective rebels in Libya are the army units from Cyrenaica that defected wholesale. Next come the Islamists, many of whom cut their teeth fighting America in Iraq and Afghanistan. But the bulk of the fighters are just ragtag civilians:

The most prevalent form of unit organization is ad hoc: a few brothers or friends sharing gas money, a few rifles, a rebel flag, and a pickup truck. Occasionally, whole villages or subsections of tribes have joined the rebels as a semicoherent unit. Yet even then, village headmen or tribal sheikhs do not appear to be leading or orchestrating the fighting. In fact, military leadership at the front, inasmuch as it exists, is entirely spontaneous. In late March, for example, the top military brass in Benghazi strongly advised the fighters not to push past Ajdabiya when it was retaken due to coalition airstrikes. The fighters did not obey orders and were quickly routed by Qaddafi's counterattacks.

Indeed, it is nearly impossible to imagine that the revolutionaries can defeat Qaddafi by military force alone. Lacking an effective chain of command or training, they have not yet learned to employ guerrilla tactics, siege tactics, or any formal coordinated military maneuvers. Arming the rebels with more sophisticated munitions will not help them congeal into a coherent fighting force. Training them might help, but it would take too much time.