Your T-bird is already unlocked, almost all of the 1.2-1.4s come that way. All you need is either a board with overclocking options like multiplier, vcore, FSB, adjustments in the bios or you can use a program like
CPUcool to overclock it from the FSb if you don't have the bios options. Overclocking from the FSB will give better performance than just multiplier adjusting but a combo of both is the best. BTW, thanx for the advice about the auto update in XP
Edit:if you use a utility like CPUcool to O/C because your board doesn't support it, you'll want to pencil in the 1 open L7 bridge on the CPU to make the default voltage 1.85v which will allow you to get more MHZ out of it. It's not hard, just use a mechanical pencil and a magnifying glass to make the little line between the to metal dots and your done. The magnifying glass is just to make certain the pencil line dosen't touch 1 of the other lines because that can short the CPU.