SEO plugins – which one/ones to use? And how many should I use??? please help.

Hey everyone.

I would like for my wordpress blog to rank highly on the Google search results so I am planning on installing one or more SEO plugins.

I have found that there are many different SEO plugins available, so I am not sure whether to install all of them, or just a select few, or just one. I read somewhere that using multiple SEO plugins ‘can affect your SERP’s in the search engines due to the different tweaks performed by the SEO plugins’. I don’t understand what that means – but I’m assuming it means that using too many SEO plugins can have a bad effect on your Google search rankings.

So, in summary, here are my questions for you guys (thanks in advance for any help):

1) Which SEO plugins do you think I should use?
2) Is it best to install just one, a few, or many/all SEO plugins?

Please note I am using WordPress version 2.8.4 and, also, I have very little experience of using wordpress so please explain anything technical as I might not understand your answer if it is quite complicated.

thanks again for your help.