Hi AJ.
Firstly, my sympathy to you and your family. It is a tough time for all involved, especially if your mum means a lot to you.
I have been through this over the last 4 - 5 years, and have just reached the end of the journey.
There is plenty of advice out there: the government website
http://www.myagedcare.gov.au/aged-care-homes/considering-aged-care-home provides excellent advice, and their phone advisers are great, but if you want to go with private advisers, then my experience has been excellent.
I'm in Adelaide and used Sharee Kelly at enquiries@agedcareinfoservice.com.au ...she could point you in the direction of someone local, or possibly advise via email...you will need to know your mum's finances down to the last detail for her to give you accurate advice. Cost about $200 a few years ago IIRC.
Honestly, lawyers are not needed for this stage, and always best avoided.
From personal experience, I would advise that if you have other family involved, please involve them in everything, but if they can't be bothered, remember to keep records of every discussion you have, or try to have with them. (For sale: A'hole brother who saw father for a few times over the last 30 years, was completely uninterested in his care, got lawyers involved in the will because he was unhappy that he was actually left the lion's share of the estate, but wanted it al!...true!!!!!)
DIY probate is fairly easy, so if you have half a brain, consider doing it yourself...it was a fairly quick and painless exercise when I did it, and you avoid lawyers, which could get expensive depending on the value of the estate.
All the best,
buff