autocompletion with vim+ctags

I wonder how many times I have googled for this recently... So why not some notes to save some time :)

Step 1: install vim
Step 2: install ctags
Step 3: download omnicpp
Step 4: download tags for stl etc.
Step 5: set up .vimrc

Generally, follow instruction of this link should be able to get everything done:
http://en.kioskea.net/faq/sujet-2367-the-autocompletion-c-c-in-vim