Park tool has a good section on how to remove the BB.
http://www.parktool.com/repair/readhowto.asp?id=93

Removing them without the proper tools can be done but you risk damaging things, and creating a really labor intensive repair. If you seriously mess up you could even be buying a new frame. Hopefully you have a friend with the right tools who will lone you them. Other wise if things start to go sour give up and buy the tools early.

Also use lots of liquid wrench. If you can let it soak for several days. Save lots and lots of trouble.