Don't do it by yourself if you didn't do it before . Not that it isn't so difficult , with the right tools and knowledge , but you can ruin your engine . A small variation when placing the belts can ( and will ) result in a completely destroyed engine . Let this do by a garage/dealer . If they do it , they know what they are doing and if it goes wrong ( yes it can happen to them also ) you have insurance ( always receipt for this work !!! ) .