10. The program uses terms I am not using, such as Estimate, or Unit Price. Can I change them?

The term Estimate is not customary in your area and you wish to use some other term? Do you use Rate rather than Unit Price? Does your business sell Services instead of Products? No problem at all. You can print on your documents the terms that suit your business best. Just go to the Settings > Document Preferences menu and make the changes you want. You will see the terms you need on the final document.