My GF and I did a small section of this walk between xmas & new year last year from Swan Lake Camp to the Cape Nelson lighthouse. Her parent live in Portlad so was able to be dropped off and picked up. I've returned to bush walking after almost 20 years and my GF is a newbe only she has done the 'Guided' Overland, however I don't really count that
I found the campsites we used, Tarragal, The Springs &Trewalla well placed with the last 2 being nicely grassed and having new drop toilets, new water tanks & small shelter with table & bench seats (handy for cooking etc). Tarragal camp had older facilities, which may have been updated this year, the water there definitley had its own small eco system so filter & purifying is a must. Having a swim in the ocean & freshwater showers (cold only) at Cape Bridgewater was definitley a bonus along with the excellent iced coffees from the Kiosk!! You do hear the woosh of the wind turbines at The Springs camp.
We've also done a day walk from the Cape Nelson Lighthouse to Portland and Mallee Camp also has toilet & water facilities and good tent sites
To do the whole GSWW in the one go may be a little daunting for a newbie, but would certainly recommend doing sections, my GF and I plan to return to do the Glenelg Gorge section at xmas this year.