Painting mistake

We're having our interior painted next week and we haven't chosen a color. We had some colors picked out that we liked but Sherwin Williams doesn't sell paint samples so I had to go to Hirshfields and get some. Hirshfields was getting new lighting and it hadn't been installed yet, but they had removed the old lighting so looking at colors was nearly impossible in the dim store. I did manage to finally find colors that were very close to the colors we like at SW. But of course, those weren't colors that they had in samples. So I ending picking colors that were actually in stock samples. We don't love any of them, but time is running out. We decided to go with the green color, but I'm afraid to commit to the color. Twice today I put on my shoes and coat to head to the paint store and look for something different, but didn't go either time. I need to call the painter tomorrow and let him know what color to buy. Maybe we should forget the paint samples and throw caution to the wind and go with a color chip that we liked. I'm so worried we're going to make a big color mistake and not like it. And it's costing over $1,000 so it's not like we can say "hey, it's only paint, if we don't like it we can repaint".