Upgrading

hi,

so it's no news now that redsn0w 4.3.1 has been released, i just needed some help, as this is the first time i'm upgrading my jailbroken iphone, and i'm not really that knowledgeable about the matter.

Currently i am running iOS 4.1 jailbroken with limera1n, all my apps, contacts, music etc is backed up on itunes, except all of my tweaks i got off the cydia store,

i just need to know if there are any steps i have to take before i go trough the jailbreaking process with redsn0w, what do i do before i use it, and how do i save all of my cydia tweaks after i've updated, i'm assuming the other apps will be recovered from itunes...

thanks for your help in advance,

Sean