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A six-figure job is often seen as the hallmark of success, but how difficult is it to find one?

Workers in certain high-paying professions are likely to face a tougher time securing a job, based on a combination of demand, skills and industry trends. Many of the six-figure jobs that are in most demand don't require advanced degrees, which may also explain their appeal to job-seekers, according to a new survey from Glassdoor.

Prospective employees in these professions should put extra time into their job search, resumes and interview prep to make sure they stand out, the employment site said. Given that median income for U.S. households stands at slightly more than $56,000, scoring a job that pays almost twice that level can be provide a significant income bump. While they may not require graduate degrees, these occupations generally require training and special skills.

The most in-demand, high-paying jobs "can attract people with an undergraduate degree and relevant work experience, which is a much bigger pool of people, in most cases, than those holding a specific advanced degree," said Scott Dobroski, community expert at Glassdoor.

He added, "In other words, if there is high competition for an open role, this translates into more people hitting that apply button online, which means it will be harder for job-seekers to get the attention of a hiring manager and potentially score an interview."

Read on to learn about the nine highest-paying, most-in-demand jobs.