Well, lets start with this, in order to do a dissolve at all, you need handles. Dissolves use the handles to make the dissolve. Without them all you would have is a strait cut. Take your dissolve and drag it onto the timeline, double click it to get it into the viewer window. You can make the dissolve as long or as short as you need it using the timecode at the top of the viewer window. Then when it fits your needs save it as a favorite so you don’t have to continue all the hard work. I’ve seen dissolves as small as two frames, it’s easier on the eyes than a strait cut.