Having found out the hard way, the verbal agreement between is worth the hot air that you can capture and take to a court for the judge to hear.
If it's not in writing and signed by both parties all you have is a version of he said/she said.
Get every thing in writing even if it a work order/reciept. These are available at office stores and any business supply type of printing company.
The write up of the job does not have to fancy, just accurate enough to allow some one else to read it and understand what was done and at what price.
Collecting bad debts is enough of a pain without having a judge tell you " You do not have a valid contract, pay you opponents legal fees and court costs."
