Questions about using 'all in one seo pack' for Wordpress

Hi everyone,

First, I'm sorry if this seems like a stupid question, but I'm relatively new!

I have a Wordpress website up with a blog page that's been up for about 6 months. The site has actually been up longer, but I switched it to Wordpress then.

Anyway, this is a site for my business and I've been working on SEO-ing and it's been working pretty well. I rank pretty highly, etc.

I want to see if I can rank better and try to rank for some new keywords and see that lots of people suggest "all in one seo pack." for on-site optimization. I've downloaded it but haven't enabled it yet, because I'm afraid it will automatically make changes to posts I've already made and that would be problematic.

I have about 20 posts and did my best to keyword optimize them in the text, tags, and permalinks. If I enable it, will it change lots of things that I did manually? For example, I have the permalinks to display as date/post-title, but I change the 'post-title' to be keyword relevant.

Basically, I just want to make sure I don't enable it and cause any problems with what's already up on my blog.

Any help would be appreciated. I thought I'd post because I was having trouble find any information on how it affects what's already present on a blog.

I wasn't sure if there were certain settings on the plug-in that I should make sure are in line with the way I've already been doing things.

Thanks! And, also, thanks for all of the great information that I've gotten here over the last 6 months or so!