Yes, as you suggest it will throw you off not having a C harp. All the techniques and scales etc will still apply… however all the jam tracks and example mp3’s throughout the course are tailored for use with a C harmonica, and it makes a big difference being able to hear exactly what you should be sounding like. So having the same harmonica (C harp) is really a must to get the most out of the course.
The good news is once you are up and running on the harmonica you will want to purchase a few in different keys. So your B harp is not wasted at all, and will come in handy later on down the track.
Keep on harpin’