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Place your lips over a four-hole span, using a light touch on the face of the harmonica. Use the top of your tongue just past the tip (called the blade of the tongue) with a light enough touch that the convex shape of your tongue does not completely flatten on the face of the harmonica. Cover the left three holes with your tongue, leaving the right-most hole to sound a single note. Move the harmonica latterly—the focus is to generally move the harmonica, not the face or jaw.

Special Note for Lower Holes continue reading...

Your tongue blocks two holes in the center, leaving the left and right holes open when performing an octave (1+ C and 4+ C for example). You can either use the tip of your tongue to block those two holes or use the tip-top of the tongue (called the blade), by using an ultra-light touch so that the natural convex shape of the tongue doesn't flatten out and cover too many holes. Give this light touch a try and I'll discuss some other interesting advantages of this light touch technique tomorrow.