You can basically hot swap your HDD with the PS4 easily, with the Xbox 1, not so easy because 90% of the users won't be able to take the console apart without voiding the warranty.
500gb is just not enough these days, I am planning to add 1TB HDD to my PS4, I might even consider adding 1TB SSD Drive when prices drop further down....
Here is a video on how simple it is to install an HDD to your PS4.
Also here is the official guide on how to do the whole process: Download & Install PlayStation®4 System Software Update from PlayStation®
500gb is just not enough these days, I am planning to add 1TB HDD to my PS4, I might even consider adding 1TB SSD Drive when prices drop further down....
Here is a video on how simple it is to install an HDD to your PS4.
Also here is the official guide on how to do the whole process: Download & Install PlayStation®4 System Software Update from PlayStation®