Welcome, Miss Violet. Everyone has some anxiety or second thoughts before surgery.
When I had my RYGB 14 years ago, it was major surgery. Now they do the same thing laparoscopically. It sounds like a root canal would've been more painful than that (and I've had both).
But the weight came off like a candle melting. I improved my diet and began taking nutritional supplements, vitamins and minerals. I started training at the YMCA so I could hike mountains. I had to buy a whole new wardrobe. I ended up dressed like this for the holidays a year later.
I'd do it over and over. I have no regrets and no restrictions.