This might be a silly question...I got a couple of shaving soap samples from Shaving Essentials- DR Harris Marlborough being one of them. It's a triangular sliver that appears to be good for a couple of shaves. I'm interested in trying it, but how the hell do I get a lather out of it? I know how to work a puck of soap with my brush, but this is wicked small. Any advice would be appreciated.