There is definitely a difference between being meticulous and being obsessive compulsive. There are those of us that like things in a certain way. Perhaps a person folds the towels in a certain way or likes to hang their toilet paper in a certain direction. The difference is that those without OCD don't feel a compulsion to do things in a certain way.
Those with OCD are compelled to perform certain tasks or rituals to blunt the fears that are tormenting them. For example an OCD sufferer may fear that the house may burn down and his loved ones perish in a fire if he doesn't make sure that the ignitors on the stove are off. The OCD sufferer will then physically touch the burner controls to make sure that they are off. Even though he is certain that the knobs are turned off, he feels compelled to continue touching the knobs over and over again. It is like he is stuck in a loop and can't make the connection that the knobs are in the off position. So, the OCD sufferer performs this ritual to try to blunt the fear that the house will burn down if he does not perform this ritual.
Another example is that involving fear of contamination from germs. The OCD sufferer may have the compulsion to wash his hands over and over again to blunt the fear that germs are everywhere and that if he doesn't continue washing his hands he will come down with some terrible disease. Some of the rituals that the OCD sufferer may perform are checking (repeatedly), counting, praying (obsessively), arranging items in a particular order or sequence, touching objects over and over again, etc. These rituals are performed because the obsessive believes that the performing of these rituals will prevent his worst fears from coming true. They are stuck in a world of abnormal fear.
There are medications that can help the OCD sufferer, but the most effective method to help the OCD sufferer involves exposing the OCD victim to his fears. A therapist will expose the patient to his fears over and over again until the compulsion to perform a ritual to blunt their abnormal fears begins to abate. It is a process that takes a long time to overcome, but it is worth it when the obssessive gets relief from his abnormal fears.