when you pull the faulty drive out,look at the jumpers on the back and set the new one the same and the bios will pick it up.
you can down load a boot disk for 98 from here
www.bootdisk.com
you save it to your computer then send it to floppy
then boot the computer from the floppy
http://www.perfectdrivers.com/howto/fdisk-format.html
collect any drivers you require before you start
modem
video ect.