Dont despair - fitting a new neck is really quite a simple job - the hard part is finding the neck that you want. There are lots of new and seconhand bits & piesce on ebay and other places. Just make sure that whatever you buy is not warped or bowed.
I have built several banjos from bits scavenged from broken instruments and it really is worth that final sense of acheivment when you play the first tune on the new banjo.
Best of luck & ignore all the pprats who have nothing better to do than continue the hackneyed jokes & banter about banjos
Good luck