If you have pre-existing .tmux.conf, .vimrc, .vim/ you should rename them as make script will create symlinks for the two previous and most likely overwrite the later.
If you have a pre-existing .zshrc rename it to .zshrc.user
run make
You may need to chmod a+x scripts/symlink_dotfiles
All should work beautifully except you will have to cd into YouCompleteMe vim bundle and compile. Beware: This can be a horrible experience if your vim/local machine is using brew python.
- shortcut explanations for tmux and vim