So yes trial and error. Don't get all wired out. Change isn't a bad word and it doesn't have to be painful and tiresome.
One reason change can be so challenging is there's no one size fit all model. Often we go into action without really understanding we can use a process.
Okay Nerd alert! There's a process called Transtheoretical Model of Behavior Change developed by Prochaska & DiClimente. Basically there's 6 stages of change that can help you achieve lasting change.