The difficulty will vairy, ppl will say there hard, ppl will say easy. i dont think difficult is the right word, chameleons arnt hard to care for in sutch, they just need more demands then say a leopard gecko. They need to be kept in the right housing, with the right lighing for them to say alive. Once you have sorted the housing out, the rest is basic. Mist 3-4 times a day, check dripper in the mornings, feed, and things like that.
to sum it up. the pysical keeping of these reptiles are bigginer, but they need a more advanced set-up and surroundings what makes chameleons a advanced pet to keep. Jamie