I've surely been there. When I was very young, I said "yes" all the time. It is a great way to get a lot of experience and I just seemed to have more time back then.
BUT, now I ... as politely as I can ... say "NO". Sewing for others can be so hard and frustration.
It is my favorite. If you seen it before, it's well worth a second viewing.
Here is the link if the video doesn't work here. CLICK HERE
And here is the backup link incase this video doesn't work. CLICK HERE
This says it all.