Any advice on negotiating or anything in retrospect you wish you'd said/done? My husband and I are getting a new car (2018 Subaru Forester) this month and both of us have only ever driven used beaters before.

He has an app that gives regional guidelines on pricing per model that's pretty specific, so we're working on what number we want to pay. We're definitely going to buy and I think we'll easily be able to get 0% financing.

ETA any feature on your new/newer car that you can't live without, or any feature that is extraneous/annoying that you wish you hadn't paid for, lay it on me