Those tabs are the wrench points. I found an adjustable wrench was barely enough for a good grip with about 22mm, although a slightly larger wrench would have been better. If you're worried about slipping, use a large set of pliers with either rubber boots, or a shop rag to protect the cam. The grip should keep you from slipping. A wrench should be good enough.

Also, There are only 2 ways to get the sprocket on the cam, sprocket facing forwards and backwards. They index so that the sprocket is always timed to the cam. You'd change that using woodruff keys. As long as your chain, and sprockets are marked as to position, and your crankshaft doesn't move, you're fine.