Worked at a dome for many years and politely removed many a chancer who thought they could rock up without a lesson. (This includes skiers and boarders; skiers the most dangerous as it’s easier to get to the top of the slope and turn yourself into a missile. Snowboarders tend to be flailing around on the floor unable to work out how to stand up once they have put the board on).
Please don’t think you can blag it or that a 90 minute lesson 1 will be enough.
If you do manage to blag it, without learning proper technique you are only holding yourself back from learning to ride properly.
Good luck anyway, you will love it!