And this is where having a strong base knowledge of networking principals is required in order to be a decent pen tester. Most of the time I spend more time figuring out how to get my lab setup than actually doing the lab itself. Then again once it is setup, it is pretty easy from there. I also tend to keep notepad++ or gedit running so I can toss notes in there. Though I may start to use Growly notes for that.
As for De-Ice... from what I remember, you need to set you IP on the attacker to match the subnet of the De-Ice box. Also make sure you don't use the same IP as the target De-Ice VM.