(This is an attorney website - I can't vouch for the attorney, but I can assure you that the info is accurate)
http://www.financialdignity.com/home...chapter-7.html
Though I would never recommend trying to do a Ch. 7 including taxes without an attorney, it is possible if you're willing to dig in your heels and learn all you can.
Be careful how the taxes are listed on the schedules and be aware of any liens.
bkforum.com is a great place to ask more indepth questions about discharging taxes. There is a wealth of information there.