I was given a couple old Horner Harmonicas one a 10 holer and another a 24 holer.
I find getting the notes clear right off are a challange, Im still very green and definately havent spent more than 3hrs playing it yet.
I went on line and orderd a couple Mel-Bay music books one for the 10 hole harmonica and the other was beginner guitar cords.
I had learned to play one note at a time on a soprano recorder and can do sight reading, all I can say is practice when ever you can, after lunch wash yer mouth and do a little playing in a quiet spot, practice is the only thing experence is the key, with time you will get it.
I find that I'd get a tune stuck in my head and messing with the recorder I could pick out most the tune or least parts, I'd play with the lights off and laying in bed (Im a single parent) so I had only the family pooches to entertain, our sled dog Blackie is the most musical of the bunch, you know its bad when yer kids yell at Dad to shut up and knock off that god awfull racket.
I use post-it sticky pads allot and make notes, I had in the beginning wrote the notes on the sheet music, even used high liter pen to mark repeats, used crayon to color the sharps and flats so I'd remember to play them in a group (Christmas,Easter,Funeral).
Do you have the notes down? I disremember what you get for a note when you blow #4 as opposed to suck#4, I think it starts out suck/blow #4 then onto #5 same thing all the way to #6 should be a scale
I'll check my book on the notes, ten all you have to do is train yourself to know what to play by sight reading.