I always make sure to do a final check on the landing page for any broken links or typos. It’s the little things that can make a big difference when people are looking to sin up.
Do one final sanity check of your customer support system. Make sure your help docs are ready, support email is working, and team knows how to handle FAQs. Nothing kills momentum faster than excited customers who can't get help.
Checking out for any mistakes that would right away point at low quality of the product. We launched ours today you can pinpoint any mistakes there if you see them. Check out AirportRegistry on my profile.