First, I start with a picture of the ideal outcome: What do I want to happen and how would I measure that it happened?
A measurable outcome is key because saying something like "I want this to work" or "I want more customers" is too ambiguous to make a plan and execute a process.
I then try to break down that process into time intervals. If the ideal outcome that solves a problem requires 100 widgets, I break it down to see if I can create 10 widgets this week, 15 the next, etc.
Each time interval, I assess if I achieved my outcome or not. If I don't, I look at the reasons why and continuously adjust until the problem is solved.
Some of the ways I adjust are asking others about their experience, finding a book that touches on my topic and trying to find it at the library, and honest-to-goodness try 15 things and see if one sticks.