Cerealusly :
Do I just shut the PC down and place the disc in and that's it?
Well, mostly.
Since this is a whole new OS install, you need to
prepare.
Find and download all the drivers for your hardware. Save these to a USB stick or DVD
Document all your username/passwords. The new OS will know nothing about them
Find all the install files for your suite of applications. And their serial numbers, if any.
Be absolutely sure you have the Win 7 license key written down on a piece of paper.
If you have more than one HDD/SSD...disconnect all other ones.
Boot up from your DVD
When it asks where, select Custom
You will see several partitions
Select each one, and Delete
Leaving one large space.
Let Windows install to that, creating what it needs.
Once done, now you have to go through all the current Windows updates
And install all the drivers for your hardware.
May I ask why you are doing this?