Hello Aging Youth (What is your real name?)
To answer a few of your questions:
I suspect the majority of people will be leaving from the Solent area and I will nominate someone on 'that' side to co-ordinate the logistics of departure. Saying that, I am sure people like Brian ,Mike and Andy Micklewright will leave from a bit further south - Torbay area. The distance is in the region 70miles and should, conservatively, take about 3 hours. Fuel is readily available in St.Peter Port - at any time - and is only a couple of minutes away from Herm.
Sleeping arrangements: Once I have a clearer idea of confirmed people I will commence bookings for the camp site at Herm. Seagull Camp Site has 2 options. There are large established tents with matresses, tables etc. They can 'house' about 8 people each and one would only need to bring food, Booze (very important) toiletries and sleeping bags. On the other hand, there are many sites to pitch your own tent - in this case - only the site is provided. They have lovely shower and ablution facilities with a small shop to get the bare necessities like bread, milk, sugar etc. You can always go taxfree shopping in Guernsey if you like.
There is obviously a charge for camping but this depends on which site you choose. This is a useful link
to appreciate what you can look forward to. I will post some pictures of the camp-site as well.
As far a moorings are concerned, a good solid anchor is something you should always carry with you anyway, but there are strong moorings available and should not pose a problem.