A longer piece of string can be run over something out of the field of view above, and used to hang a small object (like a hex nut) at about nose level. Focus on that, adjust as appropriate to have the eyes in sharpest focus, and position yourself accordingly. Just before exposure, pull on the string so that the focusing target leaves the field of view. As long as you don't move the camera in relation to the string position, you can make picture after picture.
Now, would this be a "self-portrait thread" ?
Or are you just trying to string us along?