How do I get my tub's pop-up drain out? It's stuck and I don't have a special tool.

First, try twisting the pop-up stopper counter-clockwise; many are designed to unscrew by hand for cleaning. If the entire drain flange is stuck, you'll need a tub drain wrench, sometimes called a spud wrench, which provides the proper grip and leverage to remove it without damage. If the crossbars inside the drain are corroded or broken, or it still won't budge, call a plumber to avoid damaging the tub itself.