John I can say that it can be a frustrating process learning to sing with in ear monitors and you know who I work for. However it can also be something that can be learned and used to your advantage. Don't expect an overnight acclimation and you'll do fine. With a decent signal of your own voice available in your ears the negatives of the occlusion effect are normally negated and the advantages of iem use of hearing protection and better separation of your fellow musicians takes over