Hi Oz
The key thing is that the only voices you want to listen to are the ones that are loving and benevolent, any voice that are critical, nasty, judgmental or mean is not a voice of your spirit guides or intuition.
Any time you hear the thought, "I knew that", or "I should have listened to myself", that is your intuitive guidance talking to you, reminding you to trust it and yourself. Learn to listen inside yourself. If a voice feels loving, peaceful and supportive, it is your intuition and spirit guides directing you, but if you feel uncomfortable in any way with the voices you hear, command them to be gone from you. You always have Free Will and the power of choice, so use the power of intention to direct your experience.