How can I tell if my intuition is accurate...

Or just my imagination?
The inner voice of intuitive guidance is extremely subtle. Extremely. 
It takes a great deal of self-awareness to discern the difference between the still, small voice of your Higher Self, and the ego’s fear-based yammering…which is not subtle at all and doesn’t feel particularly good. 
Practice, and most importantly, personal work are required here. If you put the cart before the horse by learning intuitive skills before cleaning up judgements and false beliefs about yourself and others, you view the world through a glass, darkly. 
Intuition will come naturally as you clear away what prevents you from being in your natural state of clarity.
Meditation, mindfulness, and being in nature are also great practices to become familiar with the subtle inner voice that is always spot on!
Work it from all angles. And if you need support on your spiritual journey, give me a shout!