Sarah Outen, 23, of Buckingham Road, Oakham, aims to become a record-breaker when she embarks on the voyage in March.
She hopes to be not only the first woman to complete this fantastic feat but also the fastest and youngest person.
Sarah will be raising money for the Arthritis Trust following the death of her father Derek in 2006. He had suffered from rheumatoid arthritis, which severely curtailed his lifestyle.
She said: "They say salt water is a healer, so I'm hoping I will reach some sort of peace out there on the waves."
Sarah, a former pupil of Stamford High School, will sail a 19ft fibreglass ocean rowing boat, called Serendipity.
She launched it on Rutland Water this week, which was the start of her rigorous training regime.
"I feared the worst; waiting for something to go wrong," she said. "Would the rudder fall off? Would she spring a leak? Worst of all, would she sink? But I needn't have worried. She is an absolute dream to row and I loved every minute."
Sarah, who works part-time at Beans in Oakham, is maintaining a training regime which includes rowing sessions on a machine set up in the greenhouse at her home, weight training and conditioning sessions in the gym.
As well as rowing on Rutland Water she will carry out sea trials and capsizing exercises before shipping the boat out to Australia at the end of January or early February.
She will take everything she needs with her for around 100 days to complete the 3,000 miles between Fremantle in Australia and Mauritius.
The bulk of her food supplies will be dehydrated meals but there will be plenty of chocolate, carbohydrates and nuts and dried fruit along with supplements and protein drinks. Two desalination machines means she can produce fresh water and will make about five litres a day.
Sarah expects to eat up to 8,000 calories a day and still lose weight.
The boat has two cabins, one for solar-powered batteries and storage, and the larger one for sleeping and shelter.