if you talk to a person at a big chain pet store take everything they say with a big grain of salt... more often then not they dont know what their talking about and are just trying to move animals healthy or not out the door...
finding lots of info on the internet and going with what the majority of sites say is prolly the best bet...
and you really should have done your research before getting the animal... thats ALWAYS preferable to getting an animal and then learning how to care for it...
i found some neet pictures of a chilean rose hair tarantula here...
http://backalley.net/rosehair/
a budy of mine had one... it was pretty cool...