When I pitch my services to someone, I compare it to something they already know.
For example, I compare a proper car detail to getting a proper facial at the salon when I am talking to a woman. I explain to her that there are many steps, as she would know, to a proper facial like cleansing, steaming, exfoliating, blemish removal, hydrating and moisturizing. I then explain that there are many steps to a proper detail similar to a facial. You don't just go to the salon wash your face and slap on a cream just like you don't wash a car and slap on a bulk cleaner wax.
With men, I compare it to painting your house. I explain to him that there are many steps, as he would know, to a proper paint job like scraping, sanding, spackling, caulking, sanding again, priming then painting. You just don't slap on a coat of paint to the house.
Furthermore, I explain that there are the proper products, knowledge, skills and techniques to use when getting a facial or painting just like there a proper products knowledge, skills and techniques to use when detailing to ensure a swirl free, marr free, hologram free, well bonded durable finish proper for your car's color to maximize it's beauty.
When you break it down like that and briefly explain the benefits of each detailing step and explain the quality of your products they'll understand. Many never realized how in depth detailing is and then they understand your pricing, have an appreciation for the service and become eager to have their car done. You finish up by telling them they can go the cheap route and get what they pay for, or get it done properly and pay accordingly (in a more diplomatic way). Offer them a couple references.
With this 5 minute conversation you have educated them while simultaneously SELLING them on your services without "high pressure tactics." Instead of waiting around for those "who have a need" for detailing, you can sell yourself to those who know nothing about it. I have received more referrals from these people than from those "who have a need" for detailing. You can not be in business without selling your business. If not, enjoy not expanding your client base by ignoring a massive market. The proper sale equals educating the potential client not selling them in the traditional sense of the word.
Hope this helps.