Well, since Morena eliminates periods in one third of its wearers and makes periods lighter in the rest, it will help with the messy, heavy, etc. Part, but not with the erratic part. Chances are, it will make your periods even more erratic, but lighter in flow and much less painful.

A dr, midwife, or a nurse practioner inserts the IUD. Mirena is good for five years, and annual well woman exams include checking its placement. Since you have a tightly closed cervix (nulliparity), you probably need to have the fitting done right after your period. Ask about anesthesia, too, and/or some drug to dilate the cervix a bit to ease insertion.