The note for step 1 part C should be modified for 9.2: in 9.2 you can type in that relative scale directly A. Determine the units, such as decimal degrees, kilometers, or feet in which the data is stored, and set them as the Map Units. C. Select or type the scale desired for the layout in the Map Scale box on the Standard Toolbar. For example, for 1:25,000, type 25000, so one page unit is the equivalent of 25,000 ground units. The Data View zooms to this scale. It may be necessary to convert the value in the Map Scale box. For example, to create a layout to scale, such as 1′ = 800′, multiply 800 times 12 since there are 12 inches in a foot, the units on either side of the scale must be the same. Enter 9600, for example: 800 x 12, in the Map Scale box. This always keeps the Data Frame in the layout locked to the scale of the Data View. If you make the Data Frame smaller, the objects will not get smaller because the scale is locked, you will just see a smaller portion of the data view in the Data Frame. If your printer has scaling capabilities, make sure it is set to 1:1 or 100% so that the scale in ArcMap and on the printer is the same. Source.