If you are running short of time, here are some basic principles to keep in mind...
Make sure to carefully read the documents in your case
Be on time for any scheduled court date
Thoroughly understand the IRS's contentions and adjustments
Research the law pertaining to your case -- seek help if needed
Be prepared with the documents and witnesses needed to support your arguments
Listen carefully to the Tax Court judge's concerns and fully respond to them
Behave respectfully to judge, witnesses, courtroom personnel and IRS attorney
Speak slowly, clearly and audibly
Dress with respect for the court
Turn off your cell phone