convert singlespeed to fixed gear

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right now i have a single speed track bike. I'm wondering what I need to do to it to make it a fixed gear. Is this a difficult endeavor? What about price?

Thanks

about 30 bucks to go super high end...

Dura Ace Track cog 19.99 (http://store.stlbikeworks.com/shop.php?c=1&n=3404731&i=B0006JI2AK&x=Shimano_Dura_Ace_SS_7600_Track_16T_332_Track_Cog)
Dura Ace Lock Ring 7.95 (http://harriscyclery.net/itemdetails.cfm?ID=675)

or

Surly Track cog 25.95 (http://harriscyclery.net/itemdetails.cfm?catalogId=39&id=2182)

Basically if you have a single speed you can toss one of these cogs on the back in place of your freewheel and have a fixed... I dunno if your hub has the smaller revers threads for the lockring or not but it might...