Besides guiding through the maze of mortgage discount points, your lender can advise you on the use of seller concessions, temporary rate buy downs, and adjustable rate mortgages.
The state of California is rife with down-payment assistance programs (many found here). Your lender can help walk you through the programs and determine if you’re eligible. They also have their ear to ground on upcoming new, or temporary programs that will soon be available.
A good honest discussion about your credit score will go a long way to determining your rate and monthly payment. Your lender can take a look at your credit, then help you determine which payments to shore up in order to raise your score.
If you are in the process of purchasing a new home, connecting with a lender early in the process is a great idea. Your real estate professional most likely has a lender (or lenders) they work with regularly, so be sure to ask them to provide lender information.