Photoshop :: Pictures Dont Print Right

I use laptop to print pictures and graphics.

I send my designs to a commercial printing company. Usual case is, is that the pictures turn out too dark or too lite, and sometimes it is due to the fact that the CMYK colors are overaly saturated causing all these colors layer to overprint and make it come out too dark. On my screen I dont see those oversaturated colors, I see a picture that looks good on screen. When Im using flat color somewhere, I have a swatch book that I use to assign number to each color and so the results are always great. But you cant do that with pictures, with pictures you have no idea. I use a color picker and set it to 5 point average to measure color, but it really doesnt tell me much. How can I measure a whole picture and be able to tell if the output looks oversaturated or undersaturated or too lite or too dark?