Expertise level: Easy
It is possible to see the amount of server resources being used at any moment from within WHM. At the top right of the screen, you can see the current load of the server. The load is an approximate measure of how much CPU your server is using - the lower the number, the better.
From the main home screen, click on the Server Status icon towards the far right end of the screen.
This will open the Server Status window. Click on the Service Status icon.
This will bring you to a complete list of applicable services, such as Apache or MySQL, as well as a detailed listing of CPU usage and hard drive usage.