This sound like run of the mill sales anxiety, which is completely normal and to be expected. Not everyone can do everything! Try to re-frame the situation, pr

This sound like run of the mill sales anxiety, which is completely normal and to be expected. Not everyone can do everything! Try to re-frame the situation, pretend you are a potential buyer and ask yourself what key things you would require or be looking for. Once you have that list, go through it and answer how your app fills those requirements. This exercise will help to remove some of the anxiety as you'll already have some pre-loaded answers to common questions. I would also consider what has worked on you in the past, as a buyer. Marketing and selling tactics are applicable no matter the industry. So, what has made you eager to try a product? What has turned you off of a product? What have other sales people done that made you close the deal? Physically write these things out in a big list. And again, once the list is complete, make some notes on how you and/or your app can accomplish the things on the list (or avoid the negatives of the list). Lastly, networking. Cold calls/emails are a starting point and might even be necessary down the road. However, networking is the key. As long as your not shilling some crap app, networking is what is needed. Getting one customer that is enthusiastic about your product and willing to recommend it to others is worth 10 unengaged customers in the long run. It's like hiring a sales person, except they are paying you for the app while they recommend it to others. If your product/app is of high quality, it'll stand on its own. Some people are able to naturally sell. If you aren't a natural born saleshuman, prepare and practice. Anticipate the questions you'll receive and have answers ready. Role-play different sales scenarios. Role-play being the buyer. As you do this more, you'll naturally become more confident which will help your sales in its own way.