Replace auto-complete-mode with company-mode

[gvim]

What would be required to replace auto-complete-mode with company-mode?
I don't know much Emacs lisp. I find auto-complete-mode makes my whole
Emacs Live! experience laggy. Maybe compnay-mode might be the preferred
option for the next release?

gvim

[gvim]

As a follow-up, how do I disable auto-complete-mode permanently in my
.emacs-live.el? These don't work:

(setq auto-complete nil)

(autocomplete nil)

gvim