There should be plenty of people in there that time of year if the park is open again. Hopefully this fire nightmare will be over by then and you'll be able to go. The uphill climb from the carpark is indeed a slog but once you get there, it's fairly plain sailing and you won't encounter too many more steep uphill sections. Are you planning on doing the full loop? We stayed at Wild Dog the first night, Dixons the second and then walked out around the lakes the following morning. We were planning to stay at Lake Adelaide but made good time so decided to return to civilisation
As I said there should be plenty of people there so if you get into any difficulty help should be a decent shout away with any luck. Weather is of course the deciding factor, could be beautifully sunny, could be freezing cold and snowing, you never know. It's such a special place though, an amazing experience.
The walk into Wild Dog is so nice as you pass the tarns and see your first decent patch of pencil pines. Definitely go up Solomon's Throne if you have the time and King David's peak has amazing views over to the Overland peaks. We did sunrise on Mount Jerusalem and that was spectacular looking out over the lakes of the central plateau. My favourite spot was actually on the way back out past Lake's Ball and Adelaide, stunning pineapple plants and red mountain rocket together in the most beautiful colours. The Pool of Bethesda is also a must see and so damn tranquil, had the whole place to myself on our second evening.
P.S. Possum proof your tent and belongings, the Dixon's Kingdom possums are very bold indeed. We saw a lady who's expensive tent had been torn open while she slept inside.
Here's my trip report below in case there's anything I missed
https://czechingoutofhere.com/2018/03/1 ... m-circuit/