[Q] [Beginner]Rooting without modifying recovery and getting device back in stock

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http://forum.xda-developers.com – Hi guys, newbie in modifying android devices. As in the title, would like to know the following: 1. How to root without touching recovery 2. Alot of guides for the device I am rooting ask to flash CFW. Then use SuperSU to root it. I am trying NOT to do this. 3. Ability to unroot and maybe even lock back bootloader How do I go about doing this? 2 devices I have are the HTC Desire V and Sony Xperia Acro S. Trying not to taint these devices and keep them as default as possible. Thanks! (HowTos)