We set our up by logging into the resource account through an outlook client. Once you are set as that resource, go to Tools>options>Calendar Options>Resource sheduling.
We checked Automatically Accept meeting requests and process cancellations.
How do direct book a resource in Outlook.
Make sure when people book the resource they add it AS a resource and not just an attendee. Noone should have to log into that resource if the meetings are booked correctly. I frequently have to train people how to invite a resource as a resource and not an attendee.