*Update: Installed MAMP Pro, reinstalled Craft, asset upload is working now. Not exactly a fix, but seemed like the simplest route of action due to my unfamiliarity with PHP. Thanks to those who responded to my question.
I'm a newcomer to web development and Craft CMS. I've downloaded and installed Craft CMS locally and I'm following along with an "Up and Running With Craft CMS" tutorial to get my bearings.
I am unable to upload assets via an asset field. The upload box appears and after selecting a file to upload the progress bar fills and freezes and the loading wheel spins on forever. Due to this I can't upload any images and therefore can't create my site properly. Please help!