Remus was in the same boat and only getting deeper every day he spent at the Ministry. This certainly wasn't the most important spell for him to learn but the entire group had been interested in it and so he decided to figure it out. He was still learning wards for places, too, and ways of protecting himself and other people. There was a lot to learn, that was obvious.
He laughed and shook his head at the message, but it was obvious that he was grateful. It'd been a lot of work to perfect it and he wasn't regretful at all. Remus caught the other coins and began charming them, first making them bare. "I bet they can think of something," he said, figuring it would be a less than innocent message. "You can start owling them now if you want, they're almost done." Once he knew the magic behind it and could actually do it, the spells really didn't take that long.
A few moments later, he tossed the coins back to James, all reading the last message James chose. "Done."