As a newbie to JJB, I find the Jenkins Sandbox guide to be a bit confusing. I'm not a sysadmin so I may not have the required background to fully understand the guide.

Suggestion: add a note to the top of the guide about minimum level of competence, something like "Users are expected to have a basic understanding of Jenkins and JJB." and add links to further info/tutorials. OR expand to give examples by scenario. Perhaps.... a job is broken in production and you want to push it to the sandbox to troubleshoot - use jjb-deploy. AND if you are creating a new job that you want to test out, install JJB and use the CLI. I personally would love to see much more detail, including a sample new job, screenshots of the terminal window, etc.