Hi SarhaR
Hows things?
Have done the TT swim last year,
Would spend a bit of time working on core strength and more importantly balance/ankle strength - which you will need. Fuel hydration also needs some attention as you'll most likely be out there for some time.
Walking wise, find something with hills, - lots of up and down - dial range is good up north as its a bit more sheltered this time of year. Down south the Hobart trail runners seem a good group
https://www.facebook.com/search/top/?q= ... %20runners and the sole mates group occasionally venture onto the trails
https://www.facebook.com/groups/235459276643370/ and they may have some more local knowledge for that end of the state.
There will be pain, -weather on top can be nasty, be prepared - some runners describe it as harder than the overland run, avoid stairs for the week after, but most importantly it is a great challenge and well worth it.
best wishes for the race