Ya use one of the bots stated above. Perf or Autofighterpro.
I used Perf for bandits, didn't work too well for me cause I don't know how to use the bot..
Yeah perf's bot is amazing it's worth it trust me, you can do bandits on it just make sure you set the hp to around 40-60 percent that way you heal hp effectivly.
As all above me said, purchase Perfect Fighter. I recommend training at a place such as Fire Giants with it, as it banks perfectly, and you make money + high amounts of experience.