I can honestly say that I have never trimmed a pistol round - generally you find that they shrink anyway over time.
I can honestly also say that I have never chamfered a pistol round. Belling them eliminates the need, and as already mentioned - on auto rounds you are reducing the surface area on your headspace, which I can only imagine being a bad thing.
Primer pockets - clean when really dirty, otherwise rock and roll with whatever the tumbler did. Same with uniforming or deburring the primer pockets. They are, after all, target/plinking rounds.
I always lube, regardless of whether or not it is rifle brass or pistol brass with a carbide die. Lubing will extend the life of your die and help eliminate overworking of the brass while in the die.