|Just install them. If they are SATA drives that should be enough, if they are PATA drives you need to set jumpers. If the system boots normal then you go to Disk Manager, delete all partitions, repartition them, and format them. If they have not been problems, a quick format should be fine, if you suspect anything, do the full format to overwrite all sectors. If there is any problem with the format, use the hard drive's utility to test the drive in question. If there were a few bad sectors, this may be able to fix them but too many or more serious problems, just remove that drive and retire it. If the drives confuse the boot, go into BIOS set up and set them to non-bootable. Typically I have not had to do this since the BIOS will typically default to keeping the same boot device active.|
If there are any additional questions, just ask. Post the results and good luck.
You have to be a little bit crazy to keep you from going insane.