Help Shopping!

Need some advice...Someone close to me has had ocd their whole life and struggles to but anything for themself. Hours, Days, Weeks are spent researching options, often the same product over and over. Eventually a product is purchased only to be returned. I try help look at the products they are showing me or assist with the research, but it always turns into a rough time and shut down on me and gets upset and doesnt want to talk anymore. I dont know how to be helpful no matter how I try. When asked which is better and I like them both equally then its more frustrating to them. I want them to be able to be happy and find things they want and be able to enjoy them. Thoughts and or tips? Anyone over come struggles with decision making with OCD?