While you can be impulsive in certain aspects of life when it comes to missions you are making a commitment that exceeds impulsiveness. You have to plan where you are going, what you are going to do, pay for the trip and take off from your work. All of these are obviously possible but they probably will not happen for you unless you schedule a trip. Get it on your calendar.
Then you can follow up with the other aspects of the trip. But the first action is to get it on your calendar. Make the the commitment to schedule it. Pledge to not surrender to the temptation to cancel the trip. Make it a firm commitment. Then you can move wholly into your preparations.