In a survey of 3,910 workers conducted between Nov. 15 and Dec. 2, 2010, 26 percent of respondents with managerial duties indicated they were not prepared to supervise when they took over leadership responsibilities, CareerBuilder said.
Additionally, 58 percent indicated they did not receive training on how to manage others, the survey found.
"Good management skills can positively impact productivity, performance and overall employee morale," said Rosemary Haefner, vice president of human resources at CareerBuilder.
In the survey, 22 percent indicated that motivating their workers was the hardest part of their jobs.
Fifteen percent indicated performance reviews were their most difficult task, while 15 percent indicated finding resources to support their team was the most difficult.
On the flip side, 59 percent of workers indicted their supervisor was "doing a good or even a great job," CareerBuilder said.
Among the most frequent complaints about managers, 23 percent indicated managers played favorites, while 21 percent indicated a lack of follow through on promises made was their biggest concern.
The survey was conducted by Harris Interactive. The margin of error on the results is plus or minus 1.97 percentage points.