Ask HN: How to hire a sales person for SME?

We my co-founder and I have built a product for storefront SME. Both of us are engineering type and not very good going door to door selling. We tried but haven't been able to convince any to buy from us. We know this product can sell because our competitor (in a different geographical area) is able to sell plenty, so it's not that we are building something no one wants. So my question is how do we hire a good sales person who can help us sell our product?