How difficult is it to immigrate to Australia

How difficult is it to immigrate to Australia? Recently, I have been frequently browsing immigration posts on various apps, from Canada, Spain, Portugal, Germany, Japan to New Zealand and Australia. The more I brush, the more I feel that Australia is a great place, but it's difficult to operate. Have you ever successfully landed in Australia? Can you share how difficult it is? Compared to life in China, do you feel happier?
PS: Both myself and my family members hold domestic master's degrees and work in IT.