Oh boy!

A winter ascent of the MR is a challenge: cold (tomorrow night at 11,000, it will be about 18F...), wind, avalanche hazard, etc., the typical Sierra Nevada winter conditions. The Great Smokey Mountains it ain't. The last 400' from the notch to the summit can be VERY tricky, depending on snow conditions. Take a look at this Youtube clip of a Sierra Mountain Center guided climb during the month of March.

http://www.youtube.com/watch?v=djokZ4HyUHk&feature=related

Notice the expedition capable equipment being used by SMI, and the caution used to avoid an avalanche zone. Yes, a rope and pro was used; especially on the descent. It is possible to descend via the trail (if you can find it...), depending on the snow conditions. We (SAR) did a body recovery in the switch-back area, of a guy that lost control while descending.

I strongly advise you (others might disagree) to avail yourselves of the services of one of the local mountain guide companies; you'll be in good hands and will have a lot of fun.

There are many youtube videos of winter MR climbs; check them out. Hopefully, others on this forum will offer their advice.