New
#81
Replacing the hd requires virtually no technical knowledge, just the ability to use a screwdriver. Your machine is a bit fiddly as there are lots of screws to undo and a few ribbon cables to unclip.
The purpose of using Dell installation media ( either your factory.wim or the appropraiate Dell recovery media ) is that it will activate automatically, and should contain any Dell specific drivers.
It is up you if you want to replace the hd yourself, or pay someone else to do it.
There are several videos showing how to replace the hd.
Dell Inspiron 15R N5010 M501R M5010 Hard Drive Removal and Installation