best thing to do is just make sure you have as much detail in you quotes as possible, do a scope of works outlining what you will be doing which materials you will be using and when you are free to do the work
Place in large capitals at the bottom of the page you will match any genuine like for like quote printed on headed paper, this may actually get the customer to properly read the other quotes rather than looking at the bottom line where the price is
I always explain briefly the outline of what needs to be done roughly & WHY!
what gears is needed & WHY!
i have found simple hints of knowledge settles or gives the customer confidence in you & your quote, now they know whats going where & roughly why.
Do you carry header & footed printed out copies with you Gary? then just write on it?
I only carry a duplicate carbon paper book and write in that, keeping the copy.