Firewallls
As with IPv4, IPv6 really needs a firewall. Linux provides this in iptables6 but as with iptables, it's not exactly user-friendly. While one is safer with IPv6, security through obscurity isn't the answer. A better answer might be the Shorewall suite.
Shorewall isn't pretty -- it's a console-mode compiler with a lot of text files. However, it is simple enough for the adminstrator, and, because it's not "pretty", it works anywhere. If you can get an SSH connection, you've got control. In addition, once it does its magic, the rest is IPtables so it's has very low overhead.
Wrap Up
IPv6 isn't magic -- and it is coming. Nearly all OS'es have IPv6 in them now, and learning it now means less headache later on. Consider the entire process took less than an hour and the benfits of a full Internet on your LAN.
This monster isn't as scary as people said.