I always get the cold feeling running through my veins when I flash my mobo's BIOS. I'm not sure if this applies to video cards, but the advice I've read for mobo's is always "don't flash unless you absolutely need to". I know with mobos you can easily turn them into bricks with a bad flash.
Im the same way, im deathly afraid of BIOS flashing. And speaking of I almost bricked my brand new Gigabyte UD3P last weekend, the BIOS flash failed and corrupted, but luckly this board has a backup secondary BIOS so it loaded that up and all is well.