What's the difference between an Australian bid and an immigration agent? Can I apply for it myself? Can you find an agent in case of failure?

To tell the truth, there is no difference between doing it yourself and looking for an intermediary agent in the process, and it is entirely possible for individuals to apply. The role of intermediary is nothing more than using professional knowledge and channels to ensure smooth and efficient process.

After the visa application fails, as long as it is not restricted by the destination country, it is theoretically possible to reissue the visa immediately. It is naturally feasible to find an agent, but the time and energy wasted by the previous failure may not be worth it.