Running a VPS is MUCH more work than using a reseller account. You're managing a whole virtual computer! Although WHM is very powerful I'd say you really need to be pretty comfortable with linux and the command line to manage a server successfully. There's A LOT to learn but there's also a lot of good guidance out there and people wanting to help you. I was pretty clueless when I started out and, although the learning curve was pretty damn steep, I got there in the end! Good luck
"They think they've tricked you. And then they have."