Some of these are to be taken with a grain of salt,
your mileage may vary:
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Harder:
- Anatomy of Security-Enhanced Linux (SELinux)
- Understanding AppArmor
- grsecurity
- What is Linux Security Module?
- 10 Basic Linux Security Tips to Implement
- The Best Linux Security Tools
- Linux Audit and Intrusion Detection
- The Unix security audit and intrusion detection tool
- Top 100 [...]

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From Linux.com:
Unless you have fully embraced the virtualization movement, you probably have more than one machine in your home or office, particularly if you run more than one operating system, and you probably have more than one keyboard and mouse on your desk. If you would like to regain some desk space without having to [...]

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Extract the files in the .ISO to a USB stick and boot off that, then on-bootup, install from the USB key, quite simple.
Here’s the full howto.

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