The biggest hurdle most people mention is finding people where everyone clicks. A lot of times, 2 or 3 out of the four of you hit it off and the 4th person isn't feeling it. Don't force it. Just be polite and move on. And dont get hurt feelings if the someone in the other couple is not interested in you. Again, just be polite and move on. As long as you keep actively searching, using the options that have already been mentioned, you will eventually find people you click with.