I typically only sew new items - draft or from pattern. I'm not the friend who will hem your pants. I don't sew for others. I don't even alter my own RTW clothing. I take my clothes to an expert alterationist. The one exception is this pair of pants. Now, I did have the waist altered (smaller with darts and an altered waistband). That's not what I'm about to discuss.
Have you ever done repairs on clothing? Did the results work out? Is the piece still worn?