[Q] Help with Root for Samsung Galaxy please!

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http://forum.xda-developers.com – I own a Samsung galaxy ace plus (GT-S7500L) and I have this phone for 2 weeks now. I really like it but I like to put a lot of apps into it and lately it's not working like the first day obviously. This is the first time I have an android phone and I read about Rooting and stuff. I want to know if something goes wrong like unshuffling or something while I do this, Can I recover my phone or something? and can I UNroot it once if I want to sell or something? I found this guide in this forum: http://forum.xda-developers.com/show....php?t=1725198 and I didn't quite really understand it well. (HowTos)