Can I jailbreak my iPhone 4S? - 2

I used to have my iPhone 3GS jail broken a couple years ago during Christmas (when it was as simple as going to ans sliding!) and I had this awesome Christmas theme that I fell in love with. I want to use it again this year, but the stuff I found online is IMPOSSIBLE to understand!
I'm running iOS 5.1.1, btw
Can I jailbreak? If not, can I downgrade my iOS to a previous version to jailbreak?

Added (1). Should've made myself clearer… I meant HOW can I jailbreak my iPhone.
I don't think Apple is going to help me out when jailbreaking is looked down upon…

Don't downgrade it you don't need too…
There is jailbreak for iphone 4S
Mam Annie.

I think you can… Better get the help of the customer care person of the iPhone service centre, they can tell you clear information

Yes, always use redsn0w (the one that's compatible for your iOS)

My iPhone 4 is jailbroken with redsn0w 0.9.11b1 and I believe I'm running on iOS 5.1

P.S- The good things from Cydia are harder to get if above 5.0 in iOS
as of now, if I download a theme with my 5.1, some of the icons won't turn into the designed pattern.
I've tried downgrading it's unbelievably hard if you've lost your S/blobs. I wouldn't recommend it.

Go to the following website:

download Absinthe v2.0.4 for your computer e.g windows or Mac

make sure iTunes is closed after you connect iphone

open absinthe and follow the instructions on screen

it takes about 4-5 mins to do, so not long at all

Yes, you can try this one.