livarp installation takes 7~15 minutes. an active internet connection is a good point but not necessary.
the installer is available from the start syslinux menu, scroll down to gui install and follow instructions..(installation for a mono-system - for more informations, please consult the Debian wiki).
once the installation process is finish, your computer will reboot. you just have to choose your session and run post-install-script (auto mode).