What's to be expected? might they remove a sebacous cyst there and then?

Schedule before: Occasionally depending on my schedule of that day i would have to time to perform minor procedures that arise on the same day.

Usually yes: Sebaceous cysts can be excised usually under local anesthetic unless they are infected. In case of the latter the infected cyst is drained, you are given a course of antibiotics and the cyst is excised later.

Depends: On doctor and whether infected.