We had the best possible guide in Obi, who made sure that everything was running smoothly, so that all we had to do was enjoy the trip. Incredibly knowledgable about everything from Namibian culture and history, to biology, geology and wildlife, and always ready to answer any questions about the things we saw. Possesed a great sense of humour too, and during the first couple of days managed to pull off quite a few wild stories that we innocently believed (don´t ever play poker with this man !). For the rest of the trip we had a lot of fun giving him a hard time whenever he tried to be serious :-)
Also our two assistants Jonas and Gecko were great guys, not to mention truly excellent cooks ! All three of them blended easily into the group, making it 12 people instead of just 9.
If you go in July, bare in mind that this is middle of winter in Namibia. I know the trip notes mention this, but I would like to point out, that temperatures actually start to drop right after sunset, which is around 5.30 pm. So bring a warm and windproof jacket, a good fleece and possibly an extra layer to wear underneath your jeans. We had two really cold nights in Sesriem and then the temperature increased somewhat as we moved north and inland, but still with a general pattern of cool/cold mornings and evenings, and warm midday/afternoons. By the way, don´t be surprised to see your local guides looking comfortable in t-hirts when you and your fellow travellers are wearing 3 layers and huddling around the fire ! :-)
Regarding camera batteries and other electronical devices, you will be able to charge in Swakopmund when staying at the lodge (they have a laundry service as well !). Also the two campsites in Etosha have facilities for charging, and as a last resort there is a spare battery in the truck.
This being my debut as a single traveller, I was slightly nerveous about spending two weeks with a bunch of complete strangers, but I had nothing to worry about. With just 9 people no one was left out, and it was amazing how quickly we became a close-knit group. By coincidence everyone happened to be within an age range of 10-15 years, which might have contributed to the good chemistry. Still, I think that the most important factor is, that you travel with like-minded people :-)