You can scarcely see through your viewfinder so if you have live view, use that to compose and to focus manually if your auto focus can't cope. Always always always use your view finder cover to stop stray light leaking in and ruining the exposure. With the cover on, your metering system should be able to cope and come up with good exposure times for you. Even so, check your histograms and be prepared to use a little +ve exposure compensation if your camera is underexposing. White balance is thrown off by it and comes out more than a touch warm, so shoot raw and adjust the balance later.