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Root Help with some rooting questions PLEASE!!!

Ok i'm sorry if this has been answered somewhere but i'm new to the forum so let apologize if it has been answered and i am just over looking it!! I am considering rooting my pt3113 Galaxy tab 2 7.0 so i can install apps to ext sd card..but i have a few questions and concerns..
#1 I am..lets say...technologically ******ed and do not want to wind up bricking my new tab..so is there a fool proof method of rooting the tablet?
#2 I know that rooting voids the warranty...so is there a way to restore back to unrooted if i ever need to use my warranty?
#3 Will my rooted tab (if i do decide to go ahead and root it) be able to receive successfully official android updates lets say to the next version i guess which would be what 4.2 (currently running 4.1.1)?

Thank you in advance for any help!!:)
 
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