Don't. Been there, done that, it's counterproductive. You have to realize that the OP has probably put hundreds to thousands of hours into reverse engineering (it's a skill just like any other) and therefore he can do something like this quickly. But note that what he's doing isn't like next level stuff. It's like someone being impressed with someone playing "Fur Elise" (i.e. a task that anyone who's spent even a couple months doing it will be able to accomplish).
As an example, I once reverse engineered encryption for data files in a game. Took me about three weeks to determine which encryption algorithm was being used, and what the key was (including learning some ARM along the way).
But I was fortunate in that I could run the game in the debugger and see what was happening, the path from reading the data to decrypting it was rather simple to figure out, and the algorithm was pretty easy to spot. If I were to reverse engineer the actual asset formats I'd imagine it would take months as you need to know how everything is tied together in order to make sense of what is happening. It looks like in the case of guitar hero, this guy has spent an extortionate amount of time reverse engineering everything.
Yet at the same time, I struggle to think of one project/area of study where I have invested enough time to wow onlookers. Maybe someone who doesn't know that electricity exists would be impressed, but that's a significantly lower bar
