The customer could be on the fence between you and a competitor and this customer could be potentially paying 10x more than all your existing customers together. It could make or break your company. They would go to the competitor immediately if you make it complicated for them and have delays with the setup. What do you do then?
That’s the story of every early stage startup. Your first customer is the “make or break” customer. Once you’ve “made” it the first time, you then have to continue to “make” it to achieve growth.