Squealing coming from air conditioner pulley.

Squealing coming from air conditioner pulley area-already had drive belt replaced, tensioner checked--I'm wondering if this could be only a bearing or would the pulley itself need to be replaced and how much labor do you think would be involved in the diagnostic and repair cuz I need to decide between a regular shop or an independent-no-overhead guy-? FYI I'm having trouble with the idle shooting up too, if that's helpful ( I know that may be a separate issue)Thank you!