Thank you for such a great question. I've always approached it from the other side. Meaning, I've always sought to seek guidance from my intuition... or from the Universe/Source/God whatever you choose to call it. So when I need something and the sign shows up, I recognize it as an answer to what I have asked for. Most people call this prayer. I view it much more practically because when I want something and I want it to be easy how I get from point A to point Z---I rely on my intuition as much as possible. So my challenge has always been seeking the answer and not getting the answer I thought I'd get and seeking to open up more and more fully to my intuition. A trusting of the process overall where I ask for "the what" and the Universe delivers "the how". As an Entrepreneur, it's sure nice to leave the details up to the Universe and trust that I will have what I need when I need it!!! It works beautifully :-)
All that said, Intuition, also known as the 6th Sense, is the most difficult to describe as the ability to experience it (and trust it) is built up over time. It is the most advanced skill. Trust is a result of your on-going experience with it. Did you read my Linked In article above? I describe how I trusted the signs when my dog was missing. I wanted her to come home and I couldn't find her on my own. I had to trust. There is a vulnerability here. I wouldn't need to doubt the source of the signs/intuitions because I wanted to find my dog. The risk was low because I couldn't make what I wanted to happen, happen. I needed the support from the Universe. That's how going for your BIG dream/Vision looks like. People like Thomas Edison/Henry Ford/Steve Jobs etc. (anyone who has accomplished something BIG) knew how to tap into their Intution and used it to derive their solutions for their inventions. As an Entrepreneur, I'm always going for something bigger that's outside my comfort zone :-)
So does it make sense that if you want something and you get a sign and it feels right to you that you follow the sign? Because you are the one deciding for what you want and then choosing whether to follow the signs/intuitions, you can stay away from what doesn't feel right to you. Intuition is a feeling and you are the decider. If something doesn't feel right to you, it's not right for you. With practice, I believe you'll know the difference. Ultimately, this is a Spiritual Guidance System---understanding yourself as a Spiritual Being is usually a life long study. To trust the Unseen for guidance is to fully actualize the Law of Attraction in your life. Whereas, most people look to the physical conditions for guidance and stop going for what they want because they have to "see it to believe it." So another answer for you is: to try and "believe it to see it". Start with manifesting a parking space ... or manifesting $20 from "outta the blue". These smaller signs will help you build your faith in sychronicities and that you can trust Source to fulfill what you really desire.
I hope this helps!! Please let me know if I can clarify further!