DIY Wheel bearing?

So the rear wheel bearing on the driver side is making a lot of noise, when I got the 1965 Dart Wagon 4 months ago it was making a low growl type noise. Now it is louder and more clunk/crunch sound.

How hard is it to do this myself? I do not have a floor jack or a garage, just hand tools. (might buy the jack though)

The wagon is a slant 4 speed with a 7 1/4 if that makes any difference.

Thanks