I havent been in this vintage 44. But, Dana's typically have the shims behind the bearings on the side
. This makes it tricky to get right, unless you have dummy bearings.. You could always use your old bearings and hog them out a bit so you dont have to press/damage the new ones while selecting the right shims..
Honestly, unless you have the right tools it would be better to let someone else do it for you.. Anthough, I've also found that many guys dont like to do it right, claiming that they have a better way.. Their way may work, or not.. Either way, if you pay him, your paying to make it right..