Yes, it's. But what is different, whether I will use Live DVD/USB stick with FreeBSD or it will install FreeBSD on separate virtual disk?
I don't know[1], but generally speaking when attempting to follow a suggestion the "recommended" approach is to follow it EXACTLY, without introducing ANY change to the suggestion, particularly if the suggestion is related to something with which you don't have familiarity or experience.
ONLY when (and if) the suggestion, implemented EXACTLY as described fails (for whatever reasons) one can try introducing variations (if it works, it just works so there is no need to introduce them, uness you take the occasion for doing further, different experiments).
jaclaz
[1] but while I still don't know, I can easily guess that a Live *something* is designed for "external" access and implemented as being not intrusive on the internal machine hard disks, so *somehow* it should (may) avoid the issue of the overlapping of the /var (that you just experienced) and possibly other issues in the mounting process which you did not (yet) find out.
With ZFS you should have previous snapshots, just grab your files from there ?!