My grandmother recently gave me her old burgundy Sheaffer. I've cleaned up the dried ink and taken it apart, but I'm not sure what to do now. This is my only vintage pen (I'm pretty new to fountain pens in general, I have a small handful of mostly cheaper modern pens). I'm pretty sure that it is an Admiral, as seen here. Here's a picture of mine:

The nib is marked "Sheaffer's Feather Touch Made in USA 5 14k"
I imagine it needs a new sac (ya think?) but what other things would a touchdown require to return to working condition? Is it likely that I can do it myself? I've noticed some corrosion on the touchdown tube, which seems to make it quite stiff. I'm less concerned about the scratches and teeth marks, but it'd be nice to fix it up aesthetically as well as functionally.
Basically, I'm wondering if its realistic for me to attempt this myself, if so is there anything in particular I need to be aware of, and if not is it worth it to pay someone to repair it? I know the last question is pretty subjective. The pen doesn't have much in the way of sentimental value for me (I never knew my grandmother to use it) but I do think it would be "neat" to fix it up and I think she might like to see it working. Still, my main interest is how it will write when its restored. If anyone has had experience with this pen or nib I'd appreciate your thoughts on its writing qualities. If I can expect a fine writing pen maybe I'll just pay to have it done right. Or maybe I'll just experiment with fixing it myself...what to do
Sorry for bothering you all with my ignorance and indecision. If you have anything to say on the subject of fixing TDs, or Feather Touch nibs, I'd be grateful to hear it.
Thanks,
Kiolden