Display,I am sending good vibes your way. As you are not the boss and a great deal of money is involved do not be afraid to clarify any decision you make with your boss before this money is dispersed.
I worked with an operating budget of 6 million dollars each year and when I did my budget for the next year I always had my immediate boss review it and sign off on it. Many times I had to work and rework that budget...................I know it can cause anxiety so remember you are not alone in the decision making.
Don't get caught up in anticipatory anxiety as it will not change anything other than to make you more anxious. Go about your day and stay in the moment.
You are going to be a winner with this project.
Cheering you on,
Kitt