Nothing is fool proof, your gonna fail and your gonna do it alot...its all part of learning be it PUA, a sport, a hobby, etc.
You dont need alot of fancy lines to get started. Pick 1 opener, 1 DHV story/subject for convo that you have something to talk about, try to kino 1 time lightly, and go from there...
Once you get comfortable opening, and staying with the set for a little convo after...then you build on that.
Its got way more to do with your confidence and your body language then what you say.