Depends on what you mean by difficult. I wouldn't say so, but they definitely aren't for kids. Costs a decent bit of money and a lot of initial time to learn and set things up. I'm still new to owning a cham. it's only been a few months, but i've definitely gotten more comfortable. what's great is, if you have the time, it is very rewarding. I love every minute i get to spend interacting with my guy and coming up with new additions to his cham room. I lucked out with an extremely personable panther, he takes to walking on pretty much anyone, loves to explore, and never hisses or bites. My only complaint with him is he's been a picky eater.
I think the only thing that worries me with chams is how serious illnesses can come off seeming minor until all of the sudden it is too late. Makes the paranoia in me go crazy. So expect to go to the vet at some point.
i read stuff for about a year before owning one and i'm still learning everyday. The fact you're asking what people think says you're probably responsible enough to own one. Just read up on their needs and decide if it's right for you.