S2 rooting advice

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http://androidforums.com – Had a look on the forum cant find 100% confirmation hope you guys can help... 1) i have GT-I9100 running 2.3.5 and am looking to root can anyone link me to a good page/site, getting confused with the world wide web! 2) i have doubletwist paid version, will this be lost when i root? and what should i do before rooting... 3) Not overly fussed but can i get ICS on this after rooting? (im with orange, if that makes a difference) @dell135 #2 (General)