Be sure there are enough hours of daylight, with a wide safety margin for any error or delay. Take note of the nearby Mountain Rescue Posts and telephones. Be sure that you know what the walk involves and do not overestimate your ability. Check the weather forecast before leaving. Conditions may change considerably during the day.
Conditions can change rapidly.
If conditions are bad at valley level they will be considerably worse higher up. Be aware of conditions in winter, which can be very severe in comparison with other seasons. Wear strong, supportive walking boots without slippery soles. Do not wear jeans. Always have more than one map and compass in a group.