My reply to a PM is as below, hope it's helpful to others
We have a campervan which means we are not under canvas and have our own loo and shower. If you don't have one, consider hiring one, lots of people do, unless of course you are tent people.
Or you could book a pre-erected teepee tent in "pink moon". There were also some little wooden hut type accommodation which looked really tiny and too low to stand up in, I wouldn't fancy those.
We did the full 4 nights both times. If you go just for the day it's a long walk from the car park and I think you'd miss out on the relaxed atmosphere by trying to cram too much in to your one day.
Comfy shoes are a must as there is a lot of walking. From the campervan camp site it's 10 minutes to the "village" and then another 5 to the main arena and stages.
There are "festival taxis" which you can use if mobility is an issue, or to carry your camping gear to your campsite on arrival, I don't know how much they cost. But once in festival mode, you soon realise that there is no need to rush anywhere!
If you get to a perfomance tent and find it's full, just look at your programme and find something else to see instead. It's a very relaxing experience.
Seating is not provided apart from some at the very back of the Obelisk arena. I can't sit for very long on the ground, so we take little tripod style seats which are small enough to fit in a rucksack. Or you can get festival seats which support your back, we tried one but found it bulky to carry around.
Oh - and it is worth it to pay an extra £35 to use "Seat of luxury" which in effect are posh loos with hairdryers, hair products etc. and are spotless!
Go for it!