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A slipstream will do fine, installing a separate firewall can be done from the net without problems (not required since the firewall in SP2 is enabled and fully functioning by default).
If you don’t want to create a separate user account with resticted rights, don’t bother with the firewall or AV either, if you don’t care about security, just leave it alone.
However, if you DO care about security, a restricted users account is better than a firewall and an AV product. If i would have to choose i’d take a restricted account policy over a firewall and two different av products running at the same time.
But don’t mind me, i have only done this for a decade.