If you want to mess yourself involuntarily, or even voluntary but have a mental block, hypnosis is terrible, suppositories are ok, but enemas are better. Supositories don't alwasy work, and if they do, their timing is unpredicable. Enemas on the other hand pretty much always work, however you have to make sure you have a diaper that can hold all that water as well as the mess. Another thing that would help when it comes to messing a diaper if you have trouble would be to start out messing a diaper while sitting on the toilet. It helps take away that mental block. Then as that becomes easier you can start messing the diaper wherever.