Tips and advice
Best advice is to plan to spend some time on the front range, seek out local area clubs that have mountain flying courses available (there are several), and attend one.
You need a healthy dose of ground instruction in addition to flight instruction specifically covering mountain flying to be safe and competent in the mountains. Most courses are a half day a day or more of ground school and at least 2-3 hours of mountain flying. You can probably also find someone that would be willing to do the training flight with you in your airplane.
Most local clubs and schools here require pilots to have a completely separate and additional checkout just for mountain flying, and I would strongly recommend that you do the same, especially if you intend to fly in the terrain in and around Leadville.
if you plan to ski then you will be flying in the winter, and winter conditions are a bit different that summer flying. Density altitude issues, especially in an RV-10, will be less of a concern. But high winds, mountain waves (lenticular clouds), turbulence, rotor clouds, wind shear, and of course winter weather issues pertaining to clouds, ice, snow, reduced visibility, and mountain obscuration are the usual things one has to be mindful of in the winter. Time of day (morning vs. afternoon) is also less of a consideration during the winter. Instead, your concerns will be flying in daylight hours only, and flying when the weather conditions dictate it is safe to fly, which in some cases may mean flying in the afternoon as opposed to going in the morning. Survival gear is something else that you will need to consider when loading your aircraft for the trip.
If you have never had any mountain flying training or taken a course on it, this is the best advice I have for you. As previously mentioned, videos will provide some of this information, but the best advice for you is to get some local training first, from pilots that have the experience and the knowledge required, before you head up to our beautiful high country on your own.
I am a 26 year veteran search and rescue pilot for the Civil Air Patrol, and in that capacity I have experienced some of the best and the worst that the Colorado mountains have to offer here in Colorado. Winter mountain flying is most certainly do-able and enjoyable if done under the right circumstances and conditions. Proper training and experience will definitely get you there.