In reply to ams558:
I've done the normal route. As others say, just rock up in the office in KK a day or so before. They'll book you a local guide (compulsory) and a space in the hut. Very easy, and going with a local guide means no groups and take it at your own pace. I remember my guide was good company, showed me a lot about the local plants and wildlife. Have a think, though, about how you want to do it. I did what most people do, KK (so sea level) to summit in 24 hrs, and not surprisingly felt a little unwell (fine getting to the top, vomited a couple of times on descent). A British couple we passed were suffering with altitude at the hut, and didn't summit. it is possible to stay at the park HQ overnight first, that's about 1400m I think, then the hut's about 3600m. In hindsight that first overnight would have been a better idea than bus from KK then straight up in one push.