WordPress Google Tag Cleanup & Setup

I’m looking to get my WordPress site running on a single, tidy set of Google tags so I can trust the traffic data I’m seeing. The immediate job is two-fold: first, locate and remove any legacy snippets... (Budget: $10 - $30 AUD, Jobs: Data Analytics, Google Analytics, HTML, PHP, SEO, Web Design, Web Development, Web Testing, Website Optimization, WordPress)