They are lovely! Congratulations!
I have three FWs. As far as service, I promise you that there is nothing that is not super simple on these machines. If you can turn a screw with a screwdriver you can easily be a master Featherweight technician.
David McCallum has a book, better yet a DVD on exactly how to do it. From routine oiling to changing the electrical cords for the foot control, even the motor brushes are SUPER easy to do. All of that can be done in just a few minutes. A complete service at a sewing machine shop will cost you more than his DVD and they likely will not do the machine justice. I highly recommend getting his book or DVD and do your own.
David McCallum has a website, including a sample of his video on the 221s. He is also more than happy to answer any emails if you are having specific problems.
Congrats again, you got some beauties! And, Happy Birthday!
:)