I subscribe to this guys youtube channel. He is one of the best at teaching PS skills I have found on youtube. While his tutorials are generally targeted at fashion/portrait type stuff his techniques can be used for general landscape and other forms of expressive photography as well.
He has packaged up a punch of really useful actions which make your life much easier when trying to get things done in PS. Watch the video and download the action pack. Have fun.
I think NIK is intended mostly for non-fashion, non-portrait work and it is especially good for adjusting brightness, tonality, contrast etc,,,but not at all automatic for young girls' faces ...