Some cranks can simply be removed by "unscrewing" the crank bolts (usually 8 mm hex). Most, however, require a crank pulling tool as indicated above. First, try unthreading the crank bolts, if they are first easy and then get a bit harder, it probably means you have built in crank extraction. Keep loosening until the cranks come off. If the bolt comes out, then you'll need a crank pulling tool. Look for washers that can prohibit crank removal. Usually there are two sizes of buttons on the crank tool. Make sure you select the correct one. The Park tool website is an excellent source for information on this procedure.

For the bottom bracket, you'll need a tool (again as indicated above). Most bottom brackets are threaded to loosen by moving the wrench forward (toward the fork). In other words, left side like regular threading, right side, reverse thread. This is just the opposite of pedals. Don't forget to apply liberal grease to all threads. If you have a cartridge bottom bracket, you're pretty much home free. Be sure to tighten the drive side real tight first, then the non-drive side. Good luck!!!!