I accidentally created the record of a child, made it the head of its own household, and made it the wrong gender....is there a way I can delete it myself, or do I need to contact SLC?
Look in the Membership Records panel, click the More link, then the View and Update panel and (I think) another More link. Then under Other Record Changes, click Cancel Record. Select Duplicate Record for the reason.
Be sure to Save when you Close. Send/Receive, etc.