I have WP installed on sub-directory(blog directory) and I wanted to manage the whole website (main page, blog,...etc.) using WordPress, so I was guided to this http://codex.wordpress.org/Giving_WordPress_Its_Own_Directory#Using_a_pre-existing_subdirectory_install
However, I can't simply overwrite/replace the index.php & .htaccess files in the root because they will miss up many other essential things. Therefore, would it be sufficient to just modify the root files with the necessary content needed for WP from index.php an files .htaccess ?! Or should I do something else ?!
Thanks in advance