Kindly check the weather, road conditions if at all you plan to travel. My advise would be not to, for temperature dips and road conditions are dangerous. If ok with you, better to plan travel to these places after winter.
Yes , you can reach easily . but you have to take care alot specially weather forecast . but the roads are accessible fr shimla to kaza in jan and feb . but from manali side its impossible till may . so , by shimla you can reach there. but first check weather forecast 🍃🙌