WHEN TO IMPLEMENT SEO

Ideally you should be considering these SEO concepts right from the
get-go; at the conceptualization and design stage of your site so that
you can integrate them into the design as it is executed. Some
designers are more SEO-savvy than others so you may even have to
educate your designer a little, or give him/her a copy of this e-book so
he/she can implement some of the ideas into the design.

However, I’m assuming that many of you already have a site up and
running that you would like to optimize, and that’s totally fine too.
These techniques can be implemented at any stage with little trouble,
and it’s never too late to start!