jack of all trades, master of none

this expression is nearly impossible to replace; it's familiar, pithy, and rhythmic. If the sex-specificity and the "master" are jarring, consider: good at everything, expert at nothing; good at all trades, expert at none; generalist; many-talented. Where appropriate, the shortened "jill of all trades" has been used. For discussion of "master" words, see master (n.). See also handyman.