I did this back in 2007 and do not have any real details for this so have set out below my thoughts / memories and then the few photos that I have.
Overall - this is not at all difficult, but the routes tend to gain altitude very quickly. Many people do not acclimatise sufficiently and on my summit day I did walk past an extraordinary number of people with altitude sickness. It is definitely worth having an extra day around 4k to avoid this. By far the worst part is the tipping system - make sure that you have this sorted out before you go!
Ascent - you start in rain forest, then scrub and then rock. Not tricky, just try not to let the constant shouts of 'pole pole' from guides and climbers alike not get too annoying.
Summit day - I very unwisely took my larium the night before summiting so I didn't sleep much and felt incredibly sick. I had a row with my guide the next morning, saying that I did not need to leave at anything like the time he wanted. I got up a couple of hours later and hot footed it to the top in time for sunrise. On the way up I passed a huge number of people collapsed by the path being sick and many others heading back down in a bit of a state. I got to the top with about 20 mins to go until sunrise. This is about right as any longer and you do start to get cold up there and it is pretty tricky trying to overtake everyone on the way up and you really don't want to miss the magical sunrise there.
Descent - perhaps the best part of all is the amazing scree run back to camp from the summit. About 1k of vertical descent which was just amazing.
Some photos
My tent and Kili in the background
The famous sign
Sunrise
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