Background Mental health stigma-reducing and awareness trainings encourage trainees to talk about mental health with the hope that increased discussions will lead to reduced stigma and increased access to mental health services. This survey study aimed to examine the current levels of confidence among participants, or “first aiders” who completed the Youth Mental Health First Aid (YMHFA) training in their ability to demonstrate the skills that were taught in the training. Additionally, this study examined the difference in levels of confidence between the YMHFA instructors and first aiders in the ability of the first aiders to demonstrate the skills that were taught in the training. We examined differences in levels of confidence among first aiders according to their socio-demographic and personal characteristics. Finally, we explored the ways in which first aiders who completed the course used their knowledge and skills after the training. Methods Seven hundred fifty-seven first aider participants were surveyed post-training and 129 first aider participants were surveyed at follow-up. Fourteen YMHFA instructors were surveyed. Results The data indicated that there was a significant decrease in confidence among first aiders between post-training and follow-up. With the exception of age, there were no statistically significant differences in levels of confidence among first aiders according to the following sociodemographic and personal characteristics: a.) gender; b.) race; c.) reason for attendance; d.) role of use. Survey data also indicated the various ways in which first aiders are currently using their training. Conclusions First aiders’ confidence declined after follow-up even though they reported various ways in which they are using their training. Instructors reported positive perceptions of the training and reported a high level of confidence in the ability of their trained first aiders to demonstrate the taught skills.