I just enabled WordPress comments on my own personal pages. For the moment I’ve enabled the SI Captcha plugin and to remove the default website link in the comment form I added the urlfilter.php file trick that I found here.

You do not need to be registered to logon but you need a name and email but all comments are moderated.

To retrofit enabling comments to older posts then you go into the All Posts dashboard option, check the box next to the title to select all the posts and then in the Bulk Actions you select Edit and then Apply. This will open a lot of selection and options. Pick the Comments option of Allow and then do Update.