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Countdown Timer Please HELP!

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Hi, everyone! I'm new to pic programming and need a litlle help. I need to write a countdown timer to pic16f628. It is very similar to Brendon Archibald's countdown timer: http://www.piclist.com/tecHREF/microchip/cntdn/restart.htm
The main differences are: 3 led displays instead of 4; counting up to 3 seconds instead of 99 minutes and the other less significant digits shows 10's of seconds; the display selection in ra2, ra3 and ra4. I will need pin 18 to be on during timing count, but this I've managed to change. But as for the rest, I don't know where to start from. The circuit will fire a relay and must not restart like the original code.
I just have a few days left to finish this project, so any hellp is welcome. thank you all. Fabio.
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