Guitar girl, simple:
Pick the 1-2-3 string with your index-middle-ring finger respectively. And your 4-5-6 strings with your thumb. I picked it up naturally after I knew that. PLay songs like Nothing else matters by Metallica, or Stairway to heaven by Led Zeppelin. They're perfect for finger picking. Then just play your normal plecktrum picked songs with the finger, and you'll have fun since the same song will sound much sweeter.