Thanks for the advice.
I have surprised myself on my salesmanship but I still come up against customer replies that I have no "rebuttal" to. It is a weakness I know I have and I am working on it.
The more I read, the more I learn, the more comfortable I am in answering customer questions and that makes them more comfortable in my services I offer them.
Ask her what she thinks it is worth. You will often find that folks will undervalue themselves more than you will. Then you can offer a bit more, and they will have some loyalty. If that doesn't work out, you can always negotiate.
In my experience, nothing sells like having someone answer the phone. If you have two cellular phones, give her one, and she can forward calls to your phone when you are available.
With a little training, she can handle the job better than you can:
Ring! [customer calling]
[receptionist]: Good morning, XXX company, how can I help you?
(pleasant voice answers with no chainsaws in the background, the customer is left with the impression that they have called a REAL company, not some yahoo with a chainsaw and a pickup truck)
[customer]: Could you give me a quote for trimming my trees? I live at...
[receptionist]: Certainly. Mr. Treesales is out on a job right now, I'll give him your information and he will probably contact you later this afternoon. What is the best time for him to meet/call you?
[customer]: I will be home from work after 5:30 this evening.
[receptionist]: I'll be sure he gets your message. Thank you for calling XXX company.
Receptionist then sends you a text message with ALL the details to the phone you keep with you. You lost no time, everything is recorded, and you have it all in your hand in five minutes. ZERO job time lost, and the customer might even get a better impression than if you answered the phone in your truck, scrambling around for some paper to write on. You can choose to call then, or later, according to what works best for you.
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Regarding rebuttals to customers comments:
Don't even try. They are probably trying to play a game, or put you in an uncomfortable position as a negotiating tactic. The best response is honesty: [somewhat confused look on your face] "Gee! I had never thought of the problem that way. Let me think about that for a minute. I'm afraid I can't give you a good answer right now."
In the end, they are so convinced that you are a man of integrity, they will overlook any perception of you being a dummy (which we both know you are not). They will feel better about themselves for being so smart, and any conflict with the customer is resolved by you deferring to them without conceding that they were right. Then you take your sweet time and come up with an excellent answer that persuades them to be quiet and give you more money.
I have found that people like me much better for my faults honestly confessed than for any of my impressive talents shoved down their throats.