Select an achievement
Don't know about you but when I'm looking to buy a product or service, I talk to my friends and colleagues and ask them for their experience. I go online and see for myself what evidence or proof exists to back up the claims. You need to reassure yourself that what I am claiming I can do is true. You need proof.
What my friends say
If I keep telling you how amazing I am and how much you will gain by working with me, you're going to think I'm bragging. If I get others to tell you, hopefully you'll just see it's proof.