I have always used the photo etch method. Printing the layout on acitate and using a UV light box for the exposure. Develop with cotton wool swabs and feric etch.
Tip for double sided.
Align the two pieces of art work face to face and sticky tape one edge.
Then sticky tape a small piece of PCB material to one edge of the art work, cut down the other side of the art work and tape that to the PCB. Finally remove the sticky taped edge and tape you UV sensitive PCB board to the artwork in a sandwich. That way it aligns.