How to remove the primary o2 sensor...

I know this is a total newbie kinda question, but the o2 sensor tool I have cannot reach under the fourth cylinder from the manifold. It just wont reach....Im being as cautious as I can here bc I really don want to strip it and have to find other means to get it out. Best way to remove this sensor?

Also, this sensor is ****ed up and fouled out, so i dont really care about keeping it clean, as long as the entire thing is removed from my exhaust mani, i could care less how i got it off