My Vanagon has a crack in its windshield.  I own a parts vanagon with a good windshield.

*How big of a home project is this to:
    -smash in my vanagon's windshield (to save gasket?) - local shop told me that?
    -prep. the windshield installation area of my vanagon
    -remove the "good" windshield from my part vanagon
    -re-install "good windshield" into my newly prepped area of my vanagon using original gasket?

Or....do I simply buy new windshield gasket for this installation?
If yes to new gasket, recommendation as to supplier.

Thanks

Larry 

PS.  We have $99 windshield junkyard places and mobile glass service companies nearby as an alternative.  Should I do this myself?