How to downgrade my iPhone 4 from iOS 6 to iOS 5.01?

I downloaded iOS 6 three days ago and I already can't stand it. How can I go back to iOS 5.1? Will an Apple genius do it for me if I ask them?

I don't think you can unless you jailbreak or something

You can't do it unless you jailbreak. If you jailbreak the Apple genius can't do it for you.
And here is a useful guide for you to downgrade your iphone.

Always find the facts and review on Apple updates before you upgrade as it not reversible legaly (without breaking any warranty). You can only do a downgrade by Jailbreaking your iDevice which will void your warrant with apple.