help oneself vs lay hands on

help oneself

verb
  • Used other than figuratively or idiomatically: see help. 

  • To serve oneself, especially to take food or other supplies, rather than wait to be served by another; used to indicate friendly permission or invitation. 

  • To exhibit self-control. 

  • To take something freely; to serve oneself without restraint. 

lay hands on

verb
  • Used other than figuratively or idiomatically: see lay, hands. 

  • To seize or assault. 

  • If we can lay hands on some chicken wire and a black light, we can make some scary Halloween decorations. 

  • To find, obtain or procure. 

How often have the words help oneself and lay hands on occurred in a corpus of books? (source: Google Ngram Viewer )