I have to say Tracey that Mudcat is a wonderful resource, but sometimes you have to trawl through a load of guff too! If you want to learn to play the harmonica properly, start from the basics and do it right. That means learning how to play clean individual notes and starting by learning to play up and down the scale and playing simple tunes. You CAN learn by ear, but you need to start with proper "building blocks" - starting with your scale notes starting from hole number 4 on a 10 hole Diatonic harmonica.

Learn the "tongue blocking" method by which you place the tip of your tongue in hole No 2 and slightly press your tongue onto holes 1 and 3, leaving a gap between your tongue and the right hand edge of your mouth to blow a clean note in hole 4 to get the 1st note of the scale. The 2nd note of the scale is a draw (or suck) note in hole 4 and then as follows:

3rd note - 5th hole blow
4th note - 5th hole draw
5th note - 6th hole blow
6th note - 6th hole draw
7th note - 7th hole DRAW
8th note - 7th hole BLOW

Once you can play up and down all 10 holes and creating clean individual notes you are well prepared to progress quickly on to the many techniques that enhance your sound. Those techniques include cross harp blues playing using the "lip pucker" method, but beware of advice from anyone trying to tell you how to play blues from scratch (without learning the basics) - too many of them are "random note and chord chuckers" who have tried to short circuit the process. OK - some of them are able to achieve a workmanlike sound, but it is impossible to get the best out of the instrument going down that route.

There are many good books available on learning the harmonica - and there are some excellent CD's, but there is no substitute for GOOD practice.

Good luck