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Then as you extract the case from sizing die, you wil feel the expander button being pulled thru the now tightened neck and expanding the diameter slightly. Thus you will feel resistance on both entry and exit from sizing die. If the exit resistance becomes noticeably strong, then lube the inside of case necks LIGHTLY before sizing with a non-oily lube OR clean/dry the inside of case neck after sizing case with a barrel bore mop of the proper size. If oil residue is allowed to run into the case body, it can later contaminate/partly kill the powder charge.
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Lubing the inside of the case neck is important. Without lube, the expander can pull the neck out of alignment with the case and effect accuracy. Putting some sizing lube on an RCBS brush made for that purpose works just fine. As mentioned, just a little.
You'll know when you have enough lube by how it feels when the case is pulled off the expander. Unlubed cases will sometimes actually screech, and this is what pulls the neck out of alignment. Properly lubed cases feel smooth and make no noise.
By holding a bunch of cases in your hand, in and out one time with the brush for each case will do it.