We could make decisions on our own with our personal / individual thinking ability or we may do this in conjunction with prayerfulness to those veritably wise.

As it is good to make decisions with others known to be wise if at all personally unsure, it is important to know that we each have inherent abilities to help us know God (abilities which as yet may be latent and developable within you):

"Blessed are the pure in heart for they shall see God." (Matthew 5)

1. clairvoyance - perceiving of visions, appearances
2. claircognizance - recognizing, knowing because of, thanks to the gifting of God, the "critical thinking" of God
3. clairsentience - nonfeelings and--or sensations 
4. clairaudience - hearing sounds non-ordinarily
5. clairolfaction - smelling aromas non-ordinarily