I believe the procedure is in the archives. The procedure essentially involves breaking the old chain with a Dremel or small hack saw, connecting the new chain to the old chain, feeding the new chain by rotating the engine and closing the new chain with a special tool. The archives will tell you where you can rent the special tool and possibly a workaround.
Your borther has a point. The M103 timing chain failures I've read about were caused by other internal failures or foreign items inside the engine. They tend not to break on their own unlike V8 timing chains.