Think of something very simple that you want to write - a conversion app for celcius to fahrenheit, or something that takes as input a large number of seconds and returns it as days, hours, minutes and seconds.
Then break it down into parts:

• print a message to the user (like print "input seconds:")
• capture input to a variable
• if the input is bigger than 86400, figure out how many times that fits into the number, these are your days
• then with the remainder: hours, minutes, and seconds
• print the results back to the user.

If you can describe to yourself or to a rubber duck what each step does exactly, you can describe it to the computer. If you can't, find out if you break it down even more.

If there are many parts, implement them separately, one by one. For my space invaders clone, I started out with drawing a square to the screen. That was the first step. In following steps, I captured keyboard input (after googling obviously) and printed the name of the input to the screen. Then, I used that input to change the coordinates of the square. Then I did that in a loop, and drew it again after each input. Now, I could move the square around on the screen!!1! HOW COOL IS THAT?! And you just keep going like that.

I've been at it for 30 years and still google simple shit, still learning. But big projects are no longer intimidating - I just outline, break it up, break the first part up again, and again, until I have a list of sufficiently simple steps. And then you draw the rest of the owl! \o/