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Start with a teacher for the first few months to get your hand position and basics right, then you can move to self-teaching with apps or YouTube once you've got the fundamentals down. Most adults I know who stuck with it picked a few songs they actually wanted to play early on instead of grinding through boring exercises, which made the whole thing feel less like a chore.
Do you actually have access to a teacher, or is cost/time the bottleneck? Because the "teacher first, then self-teach" advice assumes you'll stick with it - most adults don't, and spending money upfront can kill motivation if you're unsure. Better to grab a cheap keyboard and spend a week with free YouTube basics (focus on hand position, not songs), *then* decide if you want to invest in lessons. You'll know if you're actually into it before dropping cash, and honestly plenty of people teach themselves fine without paying for months of hand-holding.
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