Start Practising Rhythm
You can start playing harmonica on recordings, and as you practise more and more, you can learn to perfect the art. Try to learn playing and practising on different recordings. Sticking to one or two recording can affect the pace of learning.
Identifying Guitar Chords
Although it will be very difficult for you to learn to identify guitar chords, you can gradually pick up to do so, as your experience grows. With the passage of time and playing on more and more recordings, you can develop skills to quickly identify chords from guitars, and this will help you in playing bluegrass harmonica.
Learn Your Chords
While identifying chords from guitars, you can gradually learn your own chords. This requires practice on a regular basis.
Learn Other Chords
In addition to learning your chords, you can pick other chords as well. This will take some time to learn, but as you practise and develop an ability to identify different chords, you can learn other chords. This will also require an ability from you to effectively use transition option. For example, G7 is used as transition from the G Chord.
Play With Bluegrass Musicians
Playing with bluegrass musicians, no matter at what level, can help you learn to play Harmonica quickly. You can look for festivals of bluegrass musicians or other occasions where bluegrass musicians are playing and try to get into the group. Initially, you will find it difficult to get yourself into the group, but you can gradually immerse yourself into a group of musicians.