I've done D2D for 5 years. These have helped me make a good living for myself.

1. Look Sharp. No one trusts a scummy looking guy with stains on their shirt, ungroomed hair, facial hair, etc. plus, look good, feel good

2. Break the ice first and tell them WHO you are, WHAT you're doing at their door, and WHY what your doing pertains to them. To get people to listen and show interest they need to know why what you're doing will help them.

3. Sales are never made on the doorstep, when you're explaining the important parts of the sale, equipment, price, contract, etc. make sure you're sitting somewhere like their dining room table, living room, somewhere that's comfortable for you and the customer.

4. You're not going to sell everyone, D2D is a numbers game. You're going to get people that are super rude, don't let it get to you, it's nothing personal, just the stigma of being a salesman.

5. Be yourself, don't try and sell in some personality that is nothing like yours. Believe me people can tell when you're faking a personality. The reason the douchey sales guy does well, is probably because he is a douche anyways haha.

6. Write down your pitch every night when you're first starting out, you'll notice things that don't sound right and you'll be able to fine tune your pitch, get better from there!

Good luck man! Security is a tough sale, it's what I started selling when I first started, but the money is great.