As an aftermarket purchase my crankset came with the cap tool, the TL-FC16, don't see why it shouldn't come with new bikes either since it's somewhat unique (or does it usually?). I don't know about trying to use some other tool, but it shouldn't be torqued on very hard so you might be okay if you're careful with something that won't break the splines. Park sells a BBT9 that includes that cap tool along with the cup tool.http://www.parktool.com/products/detail.asp?cat=25&item=BBT-9.
Other than that, taking the crank off and putting it back on is undoing the pinch bolts on the non-drive side arm and sliding the axle/drive side crank out; when reinstalling, that plastic cap only makes sure the arm is snugged on before you tighten the pinch bolts, tighten the pinch bolts evenly and torque 'em to spec (look near the pinch bolts on the arm for the value).
Other than that, taking the crank off and putting it back on is undoing the pinch bolts on the non-drive side arm and sliding the axle/drive side crank out; when reinstalling, that plastic cap only makes sure the arm is snugged on before you tighten the pinch bolts, tighten the pinch bolts evenly and torque 'em to spec (look near the pinch bolts on the arm for the value).