How do I boot into single user mode? I know the "command s" hold down, but where do I do it? I have been trying for about 3 days. I need to install new kexts and rebuild kext cache. I've tried at every point that seems logical to me. My install is the same as this thread.

Snow Leopard 10.6.2
MSI X58M
i7 920 @ 3.33 Ghz
4 Gb DDR3
BFG GTS 250 OC