A costly mistake with a Facebook Ads 'expert' taught the speaker to never outsource a function without first developing a foundational understanding of it. This knowledge is crucial for asking the right questions, spotting red flags, and properly vetting external help, preventing expensive errors.
A marketer lost $25,000 driving paid traffic to a new, untested funnel. The key lesson is to first validate any marketing or sales funnel with organic traffic to ensure it converts before investing significant ad spend, thus avoiding wasted budget.
An expensive mis-hire came from a friend's referral. The speaker realized that while she trusted her friends, they lacked the deep marketing expertise to properly evaluate the candidate's skills. This highlights the need to critically assess a referrer's own qualifications in the relevant domain, not just rely on the relationship.