Over the past 15 or so years I build my pond. Rebuilt it at least three times. Built a big waterfall that sadly failed. Build, enjoyed and closed a small bog. Had, loved and lost forty two wonderful fish. Basically, before finding this forum I used the trial and error method. Even with all the errors, the rebuilding, the expense we've never stopped being head over heals happy with our pond. Like the title to this post states never, ever give up. 
Big Lou
Big Lou