Leaf propagation is a hit or miss business. I always start with low expectations and then feel delighted when anything works.
Regarding the variegation in your plant (I'm assuming the dreamy rosette succulent in your avatar is one and the same) you will observe some interesting things from propagating variegation that is so variable in its penetration (some leaves all white, some all green, most mixed white and green).
Leaves that are all white will most likely fail for propagation because they lack the machinery to produce energy (chlorophyll). Maybe they might sprout a baby albino rosette but I doubt it would get much further than miniature size before the energy ran out.
Leaves that are all green will most likely have higher odds of success in propagation, just because all the parts are there in working order.
Leaves that are green and white should have some intermediate rate of success, but these are the ones that will be of most value to you in preserving the variegation that you like so much, and that makes your plant so unique. Unlike all-white or all-green leaves, which should sprout mostly all-white or all-green babies respectively, the mixed color leaves have a greater chance of sprouting mixed-color offspring. And those are the ones you want.
So when you look at the stem and consider which leaf to remove to make the "window" for an actual cut, see if you can find one that's green and white.
Finally, the branches that will sprout from the main stem after decapitation (a near certainty if your plant is doing well and you cut wisely) will tend to reflect the specific type of variegation present in the leaf that was growing right next to each nascent bud. A white leaf attached to the stem may sprout a new rosette that is all-white. A green leaf left attached to the stem may sprout one that is all-green. The buds associated with earlier leaves that are no longer on the stem will tend to reflect the colors originally present in those leaves.
These are more like guidelines than actual rules, but they will get you pointed in the right direction strategy-wise.