Ask the locals!
Something missing from the current answers, and the first port of call in my opinion, unless you are somewhere very remote.
For any mountain with significant difficulties or dangers I would always try to ask a local or two (especially in countries where the mapping is poor). Some suggestions:
- The park rangers
- The local guides (they are often happy to give general advice for free)
- Hut guardians
- Farmers, shepherds and hunters
- The local climbing or walking club
- Even the local tourist office will sometimes have a route map.
While you are at it, ask about any local hazards: afternoon thunderstorms, flash floods, wild animals and the like.
If you ask someone who doesn't know, they will often pass you on to someone who does. I've had a lot of luck with this approach over the years.