Honest estimates are probably fine. If you are already drowning in work, make everything expensive enough to cover the errors. You always have some % chance to

Honest estimates are probably fine. If you are already drowning in work, make everything expensive enough to cover the errors. You always have some % chance to lose money with each customer. If the estimate is to high one can give a discount afterwards. Could play the call on the speaker and decide if it is worth dropping your tools and walking to the phone. Those 10-20 daily marketeers are definitely not it.