A federal speeding ticket is like a local speeding ticket in many ways.
Being that this is your first time I would suggest you do a little research as to what a traffic conviction does to you.
The fine up front isn't too bad, however you get a mark on your record. You insurance can now start to raise their price on your, (which is not a small amount), and next time you are pulled over for anything, your prior record can be used against you in criminal proceedings as proof that you are not a law abiding citizen. True the damage on your reputation in negligible, however what about after you have a second and a third? Often all a person has is there reputation and their record.
I suggest that the slightly hirer price of a local criminal defense attorney to fight/ negotiate this offense for you is well worth the price.
This is not legal advice. If order to give you legal advice i would need to see the Tickets and talk to the court first. Good luck:)