Clone repo into home directory and cd into it:

cd && git clone https://github.com/ab7/dotfiles_mac.git && cd dotfiles_mac

Backup old dotfiles and symlink new ones, run:

sh setup.sh

For vim install Vundle:

git clone https://github.com/gmarik/Vundle.vim.git ~/.vim/bundle/Vundle.vim

Then open vim and run:

:PluginInstall

YouCompleteMe is disabled by default because of its many dependencies. To install, uncomment Plugin Valloric/YouCompleteMe and consult the documentation to set everything up.