In a previous post I blog about installing Vim Janus and all steps are in there, but I made it a litte bit simpler.
To install vim janus just do the following commands. (on Ubuntu)
sudo apt-get install vim git python
git clone https://github.com/dnetix/vimjanus.git && cd vimjanus && ./install.sh
With those 2 commands you have a pretty good vim to use.