Downgrade an iPhone 4S from IOS6 to IOS5?

Since I've upgraded my iPhone 4S from IOS5 to IOS6, my Wi-Fi has stopped working (you literally can't toggle Wi-Fi on or off), my battery life is so bad that if I charge it to full in the morning then by 3 O'clock in the afternoon the battery will have died (even though it's been left on standby without any apps running) and my contact list has been completely screwed with. Does anyone know how to downgrade it to IOS5, I don't care whether it's illegal I just want my phone to work. It is only two months old and I haven't dropped it ever. I also can't take it to the Apple store because it is a five hour bus ride away.

Go this way:

http://itechbook.net/downgrade-ios-6-to-5-1-1-5-0-1-with-2-easy-ways.html