For simple store setups or minor tweaks, a certified freelancer is cost-effective. For complex migrations, custom apps, or ongoing retainer work, an **Agency Partner** is recommended to ensure continuity, QA testing, and diverse skill sets (design + dev + SEO).

A template-based store can launch in **4-6 weeks**. Custom designs typically take **3-4 months**. Enterprise migrations with heavy data and ERP integrations can take **6+ months**. Always define a clear scope of work (SOW) before starting.

BigCommerce classifies partners into tiers (Partner, Preferred, Elite). **Elite Partners** have successfully launched the most stores and managed high-revenue clients. They often have direct lines to BigCommerce support and engineering.

Headless is powerful but adds complexity and cost. It's best for brands that need **unique interactive experiences** not possible with standard themes, or those managing multiple storefronts/regions from one backend.