Search Engine Optimization

I’ve been debating whether to outsource full-funnel marketing next year, and I keep stumbling on mixed opinions. Some say a good agency will plug into your existing workflow almost like an extension of your team, others claim you end up spending half your time explaining basics. I’m especially curious about how this plays out with agencies that handle everything at once —Search Engine Optimization SEO, paid ads, CRM flows, content, the whole thing. If anyone here has worked with a team that takes the entire funnel, what should I realistically expect in the first few months?