The point is there are many methods to make an important decision, each one has its own merits. The key is to be aware of as many as possible and to use them where you deem appropriate. I present a few that have worked for me here. I will follow-up with an example to help fill in the gaps of this process.
I remind you that to actually decide only takes but an instant. I implore you to purse the path of that decision with all rigor & focus by taking physical action until you decide on another course of action. Revisiting a decision without additional critical information or worry is just a delay of your life.