Noob question re: ZFS on 8.0 installation

I am able to successfully install ZFS using this guide except I am having trouble with the last step, where it says to sysinstall. How do I sysinstall without clobbering what I just installed? Thanks in advance!
 
That interpretation makes sense, but some other guides explicitly recommended using sysinstall afterward. If it's not necessary, though, all the better.
 
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