One of the best things about knowing how to sew is also one if it's biggest drawbacks. It's great to be able to repair and alter clothing for oneself, but friends and others also think you're willing to drop whatever to do their stuff. And, for free! But, usually it's only the ones who do not appreciate what a skill and talent it is to sew that are not willing to pay for my time and skill. After all, it's just some simple sewing. If it was so simple, why are they not doing it?
Admittedly, I do give my close friends a discount, but I still do not alter or repair their clothes for free. Most are happy with that arrangement.