I have a sprinkler head in the garden at my house that is just too short to really get anything more than 1 foot away from it wet. I want to take this one out and replace it with a taller one. I haven't changed out a head before so this will be the first time. Is it just a matter of unscrewing the old head from the base and screwing in the new one? I would rather do it myself rather than having our usual company come out, just so I can learn how to do this a little bit better. Any help will be greatly appreciated.