The only way to beat Itachi is Good Jounin Skill and Extrem willpower to block his Hijutsu .

You don't got to be a godlike or something with Hokage Skill level .
Itachi is a simple good Jounin with a Sharingan .... and so .... .
He is no match for Hyuuga Clan leader or for any one who can summon a guardian .

Don't Forget , Itachi's Skill are balanced , no Strong spot No weak one , his only advantage is his Sharingan .

***If Gai can learn to fight at 100% blindfolded (Like DareDevil), Itachi will become History in a flash .***

Edit : Gai already learn to counter a Sharingan User (Ep:82). Asuma and Kurenai are aware of the trick to counter Itachi but not used to it.