Check my signature. *READ EVERYTHING* before doing please. I get very grouchy when I have to answer questions that I took the time to answer in the HoB OP and/or FAQ. The general idea is very simple in your case...I personally for posterity's sake would do an FXZ Keep Data to clean things up and return your system partition to full stock. (Won't touch your apps....don't panic.

Your data partition will remain). Once that's done there's an option in the utility menu to root. Make sure to get the latest Moto drivers installed and follow all directions. If you run into problems, read to see if it's answered, and hit me up either here, the HoB discussion thread, or in a PM and I'll fix you up. If you JUST want to root and nothing more, use razr's edge (search for it or PM me and I'll send you my private link to it).
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Not via OTA. The update is designed to update ONE specific version which is 246. 247 doesn't exist.