Here’s a bunch of examples to assist you in building your technique and your confidence.
We suggest you pick one and ‘do it to death’… get right in to every possibility and every nuance of the scenario. Create a solution, list the pro’s & con’s and then iterate on that solution.
Be honest with yourself, understand the compromises that you have made and why you have made them.
Once you’ve exhausted one try another and then begin to introduce the time constraint.
Finally, and very importantly, teach yourself to have faith in your decisions and to advocate them confidently… start being the leader you aspire to be.