When people did this on their sidekick/huntsman I wonder how much junk they found...
John,
I have had my Huntsman for almost 6 years and shoot it more than any other rifle I have. I never disassembled the action until about a year ago, I was surprised to find no corrosion in there. Not even the firing pin or spring had any rust on them. I do clean the firing pin by just dripping some Break-Free in and working it back and forth. After that I didn't worry about it any more. My Huntsman frame is nickel, and not blued, ss pins/parts so take that into consideration.
When I did my #11 conversion, the firing pin would stick after 5 shots or so. I would work the firing pin back and forth with Break-Free to free it up, then after that test was through I knocked out the firing pin retaining pin to thouroughly clean out the blowback. Just keep things lubed up and you should be fine.
I don't shoot Black Powder or Pyrodex anymore, so if you shoot either one of those, you might want to fully strip it down. Those powders are the most corrosive, especially Pyrodex. I have shot 777 in mine 90% of the time, I have also shot Pyrodex Pellets in it when it was new, but now it is mainly BH209.