My breast seems big and saggy after 2 deliveries.planning to have breast lift and reduction.is this procedure safe and how much it cost?is there any other safe method for my problem?

Unfortunately there are no exercises or non-surgical approaches to correct this. There are always risks with any surgical procedure, particularly infection and bleeding, but most women that have these procedures do well. You should discuss the specifics with your surgeon. Costs will vary considerably but use that as a primary criterion with extreme caution.