There are a ton of cute graphics/posters out there to help make the habits concrete for the children. My second graders are enjoying the discussions we've had about the habits. It will still take some time for them to truly grasp the concepts and apply them to their own lives. I think the time we spend on learning these life skills will really pay off.
When we learned about habit 6 "synergy" we each got a puzzle piece and decorated it with our name and things we like. The kids then put the pieces together and they did really well! It took them a while to do it, there were 26 pieces total and that took a lot of synergy from everyone. It was a great way to teach the concept! Here's a pic of our final product. :)