Patience. Taking the long view. Starting small and appreciating the changes that happen naturally.
Is there anyone who finds this easy? Not me, for sure. I like to see results and often get discouraged or lose interest if I don't. But nothing else makes gardening more satisfying and more successful than patience.
Start with perennials in four inch pots instead of gallons. You'll save money and, if planted in spring, they'll be almost as big in less than a month.
Spend time improving your soil before you plant vegetables. Maybe a few months, maybe even a year. Nothing else will give you more success than great soil.
Yes, it's one of the most difficult skills to master, but takes no effort
at all to practice.