Step 1: Staples. Lots of Staples.
Step 2: Drawer Slides
Yes that's cardboard under the slides, and.... more staples.
Also found out while taking the cardboard out that the front cross members had a nice 1/4" groove in them for me to work with.
Step 3: Adding Shelves
Got it home and learned quickly why everyone in the lumber dept wears gloves!! Mine were busy hanging on the wall. After I dug out what felt like a sapling from my hand, it was over to the table saw to get a nice tongue on all my shelves. Set the blade height and fence and ripped a test board vertically to get started, then horizontally with a shim on the fence to get the tongue I wanted. Ripped all the boards like that and then trimmed the back edge so that they would fit.
Step 4: Sanding....
Lots of sand paper, that's about all there is to it.
Got all the dust blown off and went over it with a wet rag to get what was left.
Step 5: Paint!
Definitely easiest to paint the dresser with the shelves out, lots of flat areas to hit with the roller. Shelves got painted while outside, both sides to keep it looking as neat as possible.