If you enjoyed the class you took and the instructor was one you found helpful and knowledgeable, you might find out a lot of useful information at the class. There might be some special techniques that you might find helpful. I suggest you treat yourself to a one day vacation and take the class. Like the saying "a picture is worth a thousand words" I think sometimes a live experience might be worth the time. And if you have questions there is a knowledgeable person right there to answer, plus you might also get some useful info from others in the class.