Plan ahead
This is generally the advice we give before any hike, but in cold, wet and changing weather it’s even more important.
Check the route, check the weather, research danger spots on the route and let people know where you are going. Make sure you have carefully packed and have enough extra layers, food and water for the trip. Some hot drinks in thermos flasks are going to be a great addition here.
Oh, and don't forget your walking boots.