If you can boot up the mod chip and it is flash enabled, you don't need the programmer. Flashing the bios in an xbox takes only a few seconds, but will take longer than 30 minutes using the PC programmer.
To play safe, I strongly suggest that you use raincoat 0.7 to do all your flashing. Because raincoat allows you to read back the content of the bios chip before and after the flashing, you can be sure that you have flashed correctly. It will also allows you to repeatedly flash without quiting or rebooting, so you can always repair bad flash (confirm via read back). I performed all my flashing of TSOP and Aladdin chips using raincoat 0.7.