Glad you found the post helpful. There are several techniques for combating obsessions and reducing compulsions. I'm not a therapist so I don't necessarily want to advocate one over another since OCD manifests in vastly different ways. I would say I have noticed a trend that many techniques seem to center around the concept of the person accepting doubt and in turn accepting risk -- the reason being that the compulsions to deal with the obsessions outweigh the benefits. For example, a person who has to check whether a door is locked many times may perhaps decrease the chances that the door was left unlocked but at what cost did it come? Plus, it's been shown that people who checked whether a door is indeed locked multiple times end up actually being less sure than those who simply locked the door, and let things be.
There are a few books on OCD. I would certainly stick to ones written by respected practitioners. But really, I didn't start to discover truly effective techniques until I sought counseling. Personalized therapy usually comes at a cost but when I found myself low on cash I found a free group therapy. So that would be my recommendation to your friend. If personalized counseling is not an option atm then seek out group therapy (as like I said, they are often free) and connect with others with OCD, preferably through conferences and well-moderated groups so as to avoid low-quality information. Hope that helps, and I wish your friend well. The commonly repeated notion that there is no cure for OCD has not been conclusively proven. Many therapists believe people can be cured or at least experience long periods, years, with reduced to no symptomology. Like I say in my post, OCD is known as the doubting disease. I think one thing that is certain is that doing nothing is not a remedy.
