I know about a dozen people who have done the 10-day Goenka course. It is definitely hard work because you are meditating for around 10 hours a day, but it isn't actually what I would call hard to do; all your needs and schedule are taken care of and you just give into it.
A lot of the resistance for me was actually preparing family and clients for me being completely offline and unreachable for 10 days, and going through that was a revelation separate from the benefits of the meditation.
The recommendation I give to everyone is that if you have any interest, just book a course several months out when you think you may be able to make it. If you end up not being able to or not feeling ready, then you can very easily cancel in advance, and there is usually a waiting list anyway. However, booking a spot seems to set the wheels in motion.