A member of the New Zealand Athletics team, Hamill (18) will compete in the shot put, discus and javelin events.
Hamill, who trains at her family home in Invercargill, said the weather had made her preparation "quite hard", and would soon be heading to Hong Kong for a week to acclimatise for Beijing.
"I think that will really help me, just to warm up my muscles," she said.
On top of her weekly regime of gym work and throwing, Hamill has been travelling to Dunedin every weekend to train with her coach Raylene Bates, who is also the New Zealand Olympic Team's track and field manager.
Hamill, who has cerebral palsy (CP) said she knew what to expect in Beijing after competing there in the Good Luck Games in May, and where she won a gold medal in shot put with a throw of 7.12m, setting a new New Zealand and Oceania record.
She said she was aiming to medal in all three events, but the Paralympics would be a step up from the Good Luck Games where she was competing in a field of athletes with CP.
At the Paralympics she would be competing against a larger field with a mix of athletes who had CP or spinal injuries, she said.
Even if she throws the farthest she won't know if she has won a medal until the end of each competition, as the judges apply a mathematical formula which takes each athletes disability into consideration.
"If I throw further doesn't mean I win, they might be worse off with their disability," Hamill said.
"You don't know until the end, which is annoying."
Hamill's world rankings for each event are fourth for discus, fifth for javelin and second for shot put.
Hamill said she aimed for a throw of over 21m in javelin, 15m in discus and 7.5m in shot put.
"It's a pretty big step, but I think I'm capable," she said.
A pupil of Verdon College, Hamill said people had a poor knowledge of the Paralympic Games.
People were always confusing the Paralympic Games with the Special Olympics, she said.
"It really annoys me. The Paralympics are for the physically impaired, but not mentally impaired."
An international movement for disabled athletes began in the 1950s, and the first Olympic style games were organised in Rome in 1960. The Paralympic Games are held in the same year as the Olympic Games, and since the Seoul 1988 Paralympic Games they have also taken place at the same venue as the Olympics.
Hamill said she hoped to encourage more disabled people to get into sport and to be more active.
The Beijing 2008 Paralympic Games begins September 6 and finishes September 17.
