How to go from ios6 to ios5 on my iphone 4?

It is super slow and a pain in my ***

Added (1). I want to go to 5.1.1 to jailbreak particularlly

Added (2). Restoring failed horribly i lost nearly all my apps and since my macbook is down for the count right now i can't get them all back without redownloading, anyone else have a bright idea? I would like to hear from someone that knows what tehy are talking about if you don't just tell me to throw it in the pond

Restore it to its original software off of iTunes on a computer (if it works for iPhone also)