Prepared
fit, apt, set, all set, equipped, primed, skillful, ripe, handy, available, in readiness, waiting, on call, in line for, in position, on the brink of, equipped to do the job, open to, inclined, disposed, fixed for, on the mark, in harness, in the saddle, equal to, at one's beck and call, expectant, available, at hand, on hand, anticipating, in order, all systems go*, all squared away*, on tap*, on deck*; see also able 1, intelligent 1.
Antonyms unprepared*, unready, unavailable.