The M-N's were made for peasants to use. People who didn't know to wipe the cattle crap off their shoes when entering a home, so to speak. It is and was made to be a very strong rifle to be used by soldiers who never before shot a gun or knew how to care for a gun. As long as you use factory ammo, mil-surp ammo, or stay within the loading guides, you will have no problems with it.
Just watch the cleaning after using corrosive ammo and you will be fine. Even the corrosive stuff will not affect it when you clean it.
One thing you might notice with milsurps is that the Ruskies tended to counter-bore from the muzzle if a rifle got worn. It does not affect the accuracy any, just one of those idiosyncrasies of the gun.
So don't be afraid of it, have fun. You'll know you shot it once you shoot it, as it does have a lot of recoil (less weight out front).
The only drawback, as some has said, is that once you buy one, you'll want to buy more. There is the Model 38, the Model 91, the Model 44, the Model 59, the Finish series of guns, hex receivers, laminated stocks, etc... Oh yeah, if you get the 'bug', you will know it.
And there is no cure.
The Doc is out now.
MN 91/30 round, MN 91/30 hex, MN 91/30 Laminate, MN38, MN-44, Finn M39. I might have forgot one, I can't remember.