Moving to Video - What's the learning curve?

I'm pretty knowledgeable in all things related to still photography -- analog and digital, capture, post, printing, etc. I have an opportunity to shoot video for someone looking to build some content on social media channels. Very casual, not for pay or anything, but he wants slow mo and high def. I'm looking at the Panasonic GH5. Lots of bells and whistles on that thing. It's a little intimidating, but doesn't seem insurmountable.

I'm actually thinking about putting a vintage SLR lens on it (Olympus 50mm 1.4 or 1.8). I know I'd have to control focus and exposure manually. I might also pick up a kit lens though.

I've only ever done video on the iPhone (and maybe a camcorder for family stuff way back). What are your experiences moving to video?

If you are just handing off raw footage to the person, that's one thing. If they want a finished product, better do a LOT of research; it's far more involved than most people anticipate or are equipped to handle.

YouTube is your friend; many tutorials on there...

Editing is total must if you want to have watchable video on social media. And where are plenty of videos about it .