You'll be installing localwiki on a Vagrant VM. On your host machine you'll need to install Vagrant and git (lets hope you have that already :) )
After installing Vagrant and git. Prepare yourself to download ~600MB and take 30+ min:
host$: cd [to wherever you keep your projects]
host$: git clone https://github.com/friendlycode/viget-lw.git viget-lw/
host$: cd viget-lw
host$: vagrant up
After some time you'll be prompted to ssh into the vm
new terminalhost$: cd [to your projects/viget-lw]
host$: vagrant ssh
vm$: sudo screen -r installer
Follow install instructions. When the prompt is finished and returns you to the vagrant terminal, close it.
Back to first host terminal
host$: vagrant ssh
vm$: localwiki-manage runserver 0.0.0.0:8000
host web browser: http://localhost:8000