good on you for takling up Sign Language to help others, its people like yourself that need a hug because you have gone out of your way to learn the signs and then put them into practice, well done.
I too learned sign language because I am HOH and thought that it would com ein very needy, the sign language stage 2 was very very hard indeed, and even though I failed it ( I passed the stage 1 ) I went on the learn deaf/blind manual which I enjoy very much.