Wa `alaykum as-Salamu wa Rahmatullahi wa Barakatuh.

 

As Imam Nawawi has said before doing Istikharah, one should clear the mind of all biases towards any of the two options and then turn to Allah with sincerity and offer the prayer of istikharah and offer the necessary supplication.

 

After having done so, one should act on the decision that one’s mind is inclined to choose and act upon it.

 

For details, you may access the answer linked below:

 

http://aboutislam.net/counseling/ask-the-scholar/acts-of-worship/istikharah-prayer-rules-and-signs-of-response/

 

Allah Almighty knows best.