While planning and implementing your search engine optimization (SEO) strategy, I would highly recommend keeping a journal.
Not only should you make sure you have everything in order - and that you're following a plan - but you should also document what strategies you implemented and when.
As you update content; tweak Page Titles; work on link building and continue with other SEO elements for your website, you should also refer back to various tasks and then track your results.
For example, did updating the content on your website's Home page improve rankings, traffic, and conversions? Did a new inbound link from a directory or website result in new traffic from the source? Does four blog posts per week cause more feedback than two blog posts per week?
Keep a record of your SEO actions and then compare to the results. You might be surprised at what you find.