Tracing the various circuits on the schematic with colored markers can help you decipher it. When you're finished with this stage, you'll have a collection of neatly labeled parts, ready for remanufacture. While everything is out on the workbench, now is the time to recondition parts such as tuning capacitors and variable potentiometers. Clean and lubricate every one as needed. If you don't have the manufacturer's stringing diagram, make a careful sketch of how to restring the cords on the tuner pulleys.
Some stringing setups are almost impossible to figure out without instructions.
In the following picture, Walter has begun rewiring. Note the care taken to route wires neatly and secure them with plastic ties. There's no reason why a remanufactured radio shouldn't be as neat as the original. Another thing you'll want to do before taking the radio apart is to take closeup photos and draw diagrams, if needed, to guide you in rewiring. The actual layout of circuitry is often quite different than the schematic, which is organized from a theoretical viewpoint.