Buy a couple of Air Soft pistols, some are strong enough to do them in, but some are just enough to plink them and scare them off! We have had a couple try to form a nest in the top of our chimney at our Sticks and Bricks, They would sit up there and call to each other early in the morning and the sound would travel down the chimney!
I got up early and plinked em a few times before they got the idea and moved on!
One word to that! They mate for life! So you gotta plink both of them or one will keep coming back!
Also, certain times of the year they are in hunting season! Thats when you step up to a more potent plinker!
My experience is,, your going to need at least a dozen of them to get a meal for two, search the internet for recipes, I found a good white sauce slow cooker recipe and they turned out ok! White wine with it is recommended!