Though it may seem overwhelming, travel from Kansai to Hakuba is not complicated. Public Transport in Japan is very efficient and always on-time. Check out the range of travel options from Nagoya / Osaka / Kansai to Hakuba below.
Osaka & Nagoya to Hakuba by Train
There are a number of trains bound for Matsumoto and Nagano cities. Transfer at Matsumoto for trains bound for Hakuba (the Oito line or Super Azusa Express). For precise times and info, please check out
Osaka & Nagoya to Hakuba by Bus
Direct Bus to Hakuba from Osaka & Kyoto
http://www.alpico.co.jp/en/transportation/detail.php?id=28
Highway Bus to Matsumoto then Train to Hakuba
From Osaka: Alpico Bus Info
From Nagoya: Alpico Bus Info (Meitetsu Bus Center is at Nagoya Station)
Transfer in Matsumoto to the Oito line bound for Shinano-Omachi and Hakuba (some of these connections have a long wait in Shinano-Omachi).
Osaka & Nagoya to Hakuba by Car
Take the Chuo expressway to the Okaya Junction and transfer to the Nagano expressway. Follow this to Toyoshina and exit the expressway. Follow the signs to Hakuba which will take you through Omachi and on to R148.