Superoneclick or Step by Step

Well I am deciding to take the dive and root my phone it seems the way to go to do what ever you want with the phone. But I am unsure what would be the safest way. Step by Step looks like a task to follow in detail with no mistakes but can be done, but I am also hearing about this Superoneclick which with a click of a button does it for you. But sometimes when it sounds to easy and good I guess you question yourself so I thought I ask you guys.

Once I root the phone and for some reason I may need to take it back to the retail shop is unrooting and bring my phone back to factory settings as easy?

And do I need that USB jig?