New owner in NH

[John NH]

Hey all!
So, great-grandad's two 12 ga Parkers have re-surfaced in the family. Since I'm the most gun inclined person I'm doing some research on them.

I've poked around on the site, run serial numbers etc; we have interest in seeing if the guns are safe to fire; both have 'Twist' barrels on 1 size frames and the serial #s place them manufactured in 1890 and 1895. I saw at least one of the two fired with modern ammo a few years ago, but I'd like to have someone take a look at them before we think about firing them again. Is there anyone in the New Hampshire area that would be recommended to check them over for safety, or is this a mail out job?

I've lightly oiled the metal bits, but any tips from those in the know on taking proper care of the wood?

If I wanted to give the internals a cleaning is it something I can take apart myself, or best left to a pro?

Thanks so much!