No, you can't. You'd inevitably end up also blocking yourself. However, you MUST NOT use the username "admin" for your Super User account. It's criminal, from a security point of view. You should better change that username to something not very obvious.
You know what is the joke I make during my security presentation? "Who is using username/password admin/admin on a live site?". If someone raises their hand (usually the do) I tell them "There's free WiFi here and you have a laptop. Go change the username and password, I'll be waiting here" ;)
Nicholas K. Dionysopoulos
Lead Developer and Director
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