Summarize the following:
Look for a time to ask the special someone out when it is not too noisy or hectic (Crossing a busy street, standing in line at a crowded restaurant). Also don’t be somewhere quiet enough to get other people's attention and make the situation uncomfortable. You may not want to ask anyone out when they are with friends. They may get shy and it could turn into an uncomfortable moment. Being alone will also let you stay focused on the person you are trying to talk to without any interference from others. Don't stare, just give a sweet, cute smile and when they look at you, look for a bit then quickly look away. See if you get eye contact or a smile back. If so, that is a great sign that they may be interested in you.

Summary:
Check out the situation. Wait until the person is alone. Smile and politely make eye contact.