Can I apply for an international patent without looking for an entrusting company? What conditions are needed and what is the process?

It should be said that it is possible;

But you need to apply for going abroad. For example, to apply for the United States, you need to open an account with the General Administration of Trademarks before you can apply.

Entrust the company to avoid intermediate troubles and directly give it to me to help you apply, and the cost will be lower!