First get yourself some of
these. They are the best (been mfg. longer than Hohner)
Then get yourself some of
the special sauce drink it down.
Light up a
Lucky'.
Spin some
Little Walter.
And see how it rolls.
If it ain't happening,and the hyperventilating is getting you down-take a break and try watching some of
these.
Seriously,the harp is not an easy instrument to just pick up and be able to play it well.Some cats have it and can really wail from the get go,most have to work at it some.There are alot of good dvd's out there and the link above is to just a few.
Good luck and start off slow to build up the breathing techniques.