You could only change out the outer crank bearings that way. To get to the inners, you have to split the crank into halves. This is not work for those not well set up and experienced. I sent mine to Lyn Garland of Vintage Specialties in GA. Nice guy who has been doing this for decades. I want to say it was about $200 for all new bearings. I wish someone had given me a free RD.
I wouldn't bring her home to Mama, but Mama ain't home tonight.