Installing a new drive is pretty easy...I found installing RAM much scarier when I first tried it
If the system is a laptop, the hard drive is acceissible by following the directions for removing the drive. My experience is that it's just attached to pins/socket which you just remove...then take the replacement drive and attach it in the same manner that the troubled drive was.
If desktop...just open the case, visibly locate the hard drive, note the two connections...remove those, replace the drive...close the case.
If the drive is PATA, set the jumper setting exactly as it is on the drive replaced.
There are no jumper settings to configure on SATA hard drives.
System manufacturer and model? If self-built, motherboard manufacturer and model?