here is some basic info, which is explained in better detail in Jacquetta's book:
- All 3 mentioned routes are suitable for beginning hikers/climbers, though Machame involves light scrambling and is at some points more exposed. But for any Scottish hiker this should be no problem
- Only the most crowded Marangu route offers huts to sleep in. All other routes require tents, which might actually be warmer sometimes.
- All routes can be successfully climbed if you take enough time
- On kili, 6 days is too short and will only work if you are already acclimatised or if you are willing to suffer from altitude disease (which can be lethal)
- Most people who say they 'summited' in 5 or 6 days, actually never went to the true summit, but only to the crater rim. There are even special 'summit certificates' for that. Do not believe any success ratios of organizers, only time spent will determine your chance of success
- 7 days is normal, 8 days better and people who have climbed in 9 or 10 days have normally enjoyed every step of the climb, all the way to the summit.
Hope this helps, good luck and enjoy the climb, it is a wonderful place.