Yes, 777 is easier to clean than real black powder, but that's not necessarily an advantage. I suggest that learning to to a good thorough cleaning job rather than just a quick easy one is better, unless, of course, all you are ever going to shoot is 777.
777 also has compression issues - too much and you'll get failures to fire. It can be tricky to get that part right. Better perhaps to learn the rest of the bp routine before adding that to the mix.
Finally, 777's higher pressure curve produces a different result than the other powders; once you've worked up your 777 load the value is of no use if you should need to switch powders. If that's all you're going to shoot, fine, but I'd think it would be better to get your gun's optimum load using one of the milder powders first.
My suggestion, in lieu of real black, would be Pyrodex. It has the same cleaning issues and almost the same pressure curve as real black.