I have used Aero cloners for a couple years now, and funny enough I was sold on them originally because they have "better success than other methods". I think this is FALSE.
I hit almost 100% success rate, and also found this easy as a beginner, if I did the following:
1) Take cutting with a sharp tool @ 45 degree angle
2) Trim the clone down, if necessary. You don't want to have more than a few inches of stem, nor do you want to have more than 3 or 4 nodes with leaves, otherwise the plant will have TOO MUCH vegetation to try and support, lowering success rates.
3) Next, trim the tips off the bottom fan leaves of your clone, as this will help induce eating those lower fans for nutrients and root growth
4) If you have humic acid, soak it in this solution for a few mintues
5) Next, dip the clone into a rooting gel or powder
6) Before planting, I have a beneficial bacteria powder that I sprinkle around where the SOON TO BE root zone will be. This bacteria will create the ideal enviornment for root zones the sec they begin development, and will help them thrive.
6) Next, place gently into soil/peat moss cup, and spray down when finished until soil and peat cup are both moist all around, but not soaked. Keep in saucer trays and maintain this level of moisture. Pending on strain, roots should show within a week or two.
Hope this helps, cheers!