*Before beginning - know what fabric is on your couch. There are usually tags on your couch that says if it can be cleaned with water or must be dry cleaned, etc.
Start by vacuuming your couch. I started by using my crevices tool and this tool gets in all the creases. My friend's couch's cushions were all attached. I went in every crease that couch had. If your cushions are not attached - remove the cushions and get in all the creases all over the couch.