How is she equipped to portray a men??

Portia says she will be handsomer, where her sword more gracefully, speak like a teenage boy, and walk like a man:

"That they shall think we are accomplishèd

With that we lack. I’ll hold thee any wager,

When we are both accoutred like young men,

I’ll prove the prettier fellow of the two,

And wear my dagger with the braver grace..."