Add 3D Animation to Video

I have an educational video that needs a visual boost. You will watch a short instruction clip first, then layer in simple 3-D animation and motion graphics built from the stock photos and transparent PNGs I supply.

Everything should feel cohesive with the existing footage—clean, engaging, and clear—while keeping the learning content front and center. Once complete, deliver:

• The fully edited HD video with integrated 3-D elements
• All project files so I can make future tweaks if needed

Please tell me, in a few lines, about similar 3-D animation or video-editing work you have handled; your experience will guide my decision.