sorry to ask such a noob question but never done this before. I usually change my WP theme before I get good SERPs on Google but now i want to change my WP theme when I am actually ranked 1st in my keyword. Wondering if that will bring any effect on my SERPs? Also my permalink is something like domain . com/p=164 if i change it to be seo friendly like domain . com/bla-bla-bla does it have any effect considering my web pages have been indexed?