This is one of my favorite shoulder pressing variations. It's not only a great way to spice up your shoulder workouts and hit your shoulders a bit differently, but it also requires some additional core muscle engagement in order to maintain the offset load.
Although you can certainly perform this exercise using a dumbbell, do it with a kettlebell because its design really works well for this exercise.
Sticking points are much like those really talkative, naked old men in your gym's locker room: you'd rather avoid them! Nothing's more frustrating than making good progress overall but failing to improve on the "big lifts" (bench press, squat, deadlift, military press, etc.)