In reply to nickbidi:
This may have been better posted in the hill talk forum, not sure if you can move it!
If you could comment back with your relevant summer mountain walking experience then we can more accurately target our advice.
I'm assuming here that you mean "Mountain Walking" as apposed to "Mountain Climbing" which involves ropes and harnesses! As mentioned there is the Normal walkers path up to the summit which initially is very well defined and easy to follow. However as you near the summit it is less defined and obviously in most winters is under snow so not visible on the ground at all! There are cairns to direct you off the summit difficulties, but in poor visibility, ie thick cloud or dark they can be to far apart to see, also by late winter some are usually under snow (unlikely this winter), so you should be very confident in your compass and map work. Being the highest mountain in the UK, in Scotland and in winter it can get very wild, very quickly up there! So if your a reasonably experienced summer mountain walker, confident in your compass and map work, take head of the mountain weather forecast and have the appropriate equipment and knowledge of how to use it, then sure why not, give it a go and be prepared to turn back if not happy. If one of the above doesn't apply then I would say join your local mountaineering club and gain experience closer to home, on some less demanding hills and mountains. or save up and use the services of a guide, perhaps find another couple to join you and split the cost between the 4 of you!