The test comprehension sheet forces you to think through your value proposition before putting time and effort into testing it. Do you explain the pains and gains of your product and do you back it up with evidence?
The first thing you want to do is to recruit your participants. Use template email to reach out to potential participants.
The experiment sheet forces you to make critical factors explicit: What needs to be true for your idea to work, how success and failure looks like, how you are going to test your hypothesis, what you are going to measure.
The learning sheet forces you note critical factors about what you learned from an experiment and will help you ensure that you make the resulting decisions and actions explicit.