You can use an impact on the 12s, but then you can't feel whether you're stripping the threads. Back them off evenly by hand, keep a little tension on the cone washers, and they won't fire across the shop.
Full video: https://youtu.be/xJHGybEA318
More 2nd gen guides: https://standardamericanoutdoors.com/f/2nd-gen-4runner-maintenance-guide-how-to-make-yours-last-300000
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Full builds, parts and guides: https://standardamericanoutdoors.com
More 2nd gen guides: https://standardamericanoutdoors.com/f/2nd-gen-4runner-maintenance-guide-how-to-make-yours-last-300000