Tourist from South America. What are the best ways to get to the Highlands and Loch Ness?

Sorry to ask another boring travel question. I tried to research and I didn't find any good information. I'm heading to London today and I'll be in Edinburgh next week. What are the best ways to get to the Highlands and Loch Ness? I'll stay only 2 days in Edinburgh, will I have time to do both?

I'll gladly receive any suggestions, I'm totally lost... =p

Thanks!