I don't know specifically what make and model your bottom bracket is, but here are some tools you can use to remove your cranks and BB:

* A Crank puller that can remove square taper cranks, like the Park Tool CWP-7.
* A hook spanner (aka bottom bracket wrench), like the Park Tool HCW-5.
* A wrench to turn the crank puller (if yours doesn't have a built-in handle), as well as to turn the fixed cup (drive side) of your existing adjustable bottom bracket.
* A pin spanner to turn the adjustable cup of your bottom bracket, like the Park Tool SPA-2. In a pinch, you can use other tools that fit into the cups dimples to turn it. A pair of small Allen wrenches would work.

To remove the crank arm, remove the crank bolt. Then thread a Crank puller into the threads on the crank arm around the bolt. Turn the crank puller to force its tip inward, which will push on the end of the spindle to force the crank arm off. Repeat on the other side to remove the other arm.

To remove the bottom bracket, use your hook spanner to loosen the lockring on the non-drive side. Then use your pin spanner (or improvised substitute) to turn the adjustable cup until it's threaded out of the bottom bracket shell. Slide the spindle out. On the other side of the bike, use a wrench to turn and remove the fixed cup of your old bottom bracket.

If you're replacing your bottom bracket, make sure you get the appropriate tool to install the particular bottom bracket you have. The tool varies by manufacturer and type of bottom bracket.