You could learn Google Ads, build a website, set up a missed-call system, and manage a reactivation campaign yourself. Everything you need is on YouTube. So why would you pay someone else to do it?
The time cost of DIY is almost always underestimated
Learning each tool and doing it reasonably well takes 40–80 hours per component. A competent Google Ads setup for a local business takes an experienced person 8–12 hours. It takes a first-timer closer to 40 hours — plus another 20 hours of mistakes and corrections. At $75/hour equivalent for your time, that's $3,000 in opportunity cost. For one component.
Knowing what to do matters less than knowing what to fix
Setting up a campaign is the easy part. Diagnosing why it's underperforming is the hard part. That requires seeing enough campaigns to know what normal looks like — and what a subtle keyword match issue or landing page failure looks like before it wastes a month of budget.
When DIY makes sense
If you have an existing marketing background, significant spare time, and genuinely enjoy the work — DIY can make sense, especially at early stages. If you're busy delivering services, managing a team, and dealing with the normal chaos of a growing business, the math on outsourcing is usually clear.