I have a susuki forenza and I need to replace the driver's side door handle. I already have the new part (door handle).

On the inside trim, you can remove screws that are by the door handle, arm rest, under door and side of door and then gently pull back on the panel as there will also be retaining clips attached and you don't want to break them. You'll need to lift the door panel upwards in order to get it off the window ledge. Then you'll need to manipulate the panel and disconnect the door handle linkage from the door handle and disconnect the wiring for your controls. Then you can remove the inner door handle and replace with new one. If it's your outer door handle, pull back the weather seal and disconnect the linkage to the outer door handle and then remove the bolts securing the outer handle to the door