I am planning on making a mushroom terrine for Thursday night, it calls for sheet/leaf gelatin, which I assume is a pain to find. The one baking supply store in our area that might have it takes a vacation between Christmas & New Years. The recipe says to soak the sheets in cold water, wring them out & add them to the hot liquid to dissolve. In the case of using powdered gelatin instead, do I just add the powder to the hot liquid to dissolve or somehow soak in cold water first? Not sure how that works, any assistance would be helpful. I'm new to gel/aspic stuff.