It sounds like you don't feel confident opening up the attic yourself so I won't make any suggestions starting with that premise.
You're probably going to need an exterminator who will have the tools to access the space. They will make sure all the critters are out, set traps and locate entry points that will need to be blocked. They may be willing to do that work for you but most likely you will have to get some one else to do that if you aren't comfortable doing it yourself.
They're are various sonic devices and repellant chemicals on the market but they all require some proximity to the area you want to protect. A walk through the pesticide section at HomeDepot will give you an idea of what's availabel if you want to try doing it yourself.
Good luck!
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