It just takes time to read the tutorials, experiment on making simple things, read the tutorials, make harder things, read the tutorials. Did I say read the tutorials? The best way for me to learn is to read, read and read some more. Make something simple, progress from there. Its how I learned to mod the Baldur's Gate games with the fan made tools. They're not that hard once you learn to use them correctly but they can be intimidating for someone who doesn't know at first.