Hi Emily,
No, you don't need to join a club. That bit about approval really is only for people who might be winning and stuff.
Yes, I did a sports tour last year (2011). It was rubbish and I did it all myself this year (see p8) and found things much easier.
For example it was so much easier not having the time of my shuttle back to the airport changed at the last minute (worse still they didn't tell 2 others on the tour! They were NOT pleased). It was so much easier making my own way back after the race with other runners rather than going to a prearranged meeting place and finding nobody there and having to sit around on the grass, soaking wet, nauseous, having run 56 miles, as night fell, waiting for my other half to track the tour peeps down.
Basically it had been subcontracted to a local firm and they did all the easy bits you can do anyway like booking accommodation or a hotel airport shuttle, except not terribly competently, see above, but there was none of the extra advice and care you would normally expect from a sports tour - I have been on several with RunningCrazy and this year went to Boston with Sports Tours International and each time was really well looked after by people who were other runners and knew what you needed.
In other words - flights are flights so as a young woman really there's nothing to worry about there. Perfectly civilized.
Accommodation you can book over the interweb and again once you get there it will be secure & the folk at the hotel / hostel desk will call taxis (which are cheap) for you and /. or advise where you can go, where to find things etc.
There is a shuttle from the airport which stops at lots of hotels & hostels and you don't need to book that from the airport, it leaves just outside the airport building. "Just outside the airport building" being if anything rather more nice than say Luton! Get the hotel to ring up for you to book the return shuttle (actually I rang up myself and sorted it and was v. pleased as by SA standards my accent is often inpenetrable).
So that gets you to your hotel or hostel. You will need to get to the Expo. Consult at the hotel desk: you'll probably be able to walk or take a bus. I sometimes got the hostel or hotel to ring a taxi for me (see above re my accent) and that would usually cost around a fiver, the fare that is.
There are some food stalls at the Expo and it is not far from the beach where there are some cafes such as Joe Cools or the News Cafe in the Sun Coast Casino. The hostel/guesthouse I stayed in had a Spar over the road and a kitchen so that was good too.
The Expo is next door to the Hilton so I just emulated Carmen and got the nice doorman to hail me a taxi when I needed to get somewhere from the Expo (also after the race). I am not in general a great fan of taxis but there were no real problems, particularly once I realised that the doorman knew how to pronounce my destination even if I didn't
Beh-ray-ah? Beh-ree-ah? Still can't remember!
You'll have made lots of buddies on the forums so you won't be alone once you get to SA (you may even meet folk on the plane out).
That covers it I think...