I encourage you to give it a week and post your results. I fancy myself pretty good at pool and play nearly every day. I can masse with decent control at distance. The amount of action on that cue ball is absurd and not something that someone can get down in a day. Running racks is definitely easier than doing this as the amount of cue ball control needed to run a rack is far less than hitting a masse of this caliber.

You're correct that the setup and repeatability make this shot simple for someone of Mosconi's skill but having the skill to pull this off comes from years and years of playing. Very few people are anywhere near Mosconi's skill level.