Prior to law school, McComas served in various positions in Wyoming, first as a file clerk for the Wyoming House of Representatives in 1977. She also served as an administrative assistant for the Community Action of Laramie County, WY in 1977. In 1978, she became a legal intern for the Wyoming Department of Health and Social Services. In 1979, she moved up to a legal researcher for the National Organization of Social Security Claimants' Representatives, Finally, she served as an intern for Legal Services in Albany County, Wyoming from 1979 until 1980.