Almost nobody stands up gracefully on their first go, and that is half the fun. You fall off for a bit, then you ride some white water to the beach, and that is more or less that. You are a surfer now.
There is a myth about territorial locals guarding their break. Ignore it. The people teaching you are there because they like sharing it. Standing up is the easy part, and most people manage it on day one on a big foam board, known to everyone as a foamie. The real skill comes later: picking the right waves, timing your pop-up, and earning a spot out back on the unbroken face. That takes a while, which is rather the point.
The coaches on adventuro will put you on the right board and meet you wherever you are, first lesson or fiftieth. You get wet either way.