You do your final PP to your image acording to the printer that it is going to do the job and then print a A4 proof and see if the printer can replicate your calibrated image on the screen.
You can have in PSCS3 a soft proof on the monitor if you trust it.
If you are happy with it then save the final version.
I am sending my tiff files with open layers to a person that does all the work for me. He print an image according to his Monitor/printer and send it to me for my approval.

