If you figure out the repetition that occurs around the gaps, you've got the pattern. Take this interweaving of four triangles. I spent forever trying to figure out how decide which triangle was on top and how they related. Now I had been working out the steps for the pattern 'Stoic', which Rick and Maria haven't posted yet, and I suddenly realized this was the same concept.
A line radiates from one side of the diamond, and you repeat the line on the other three sides. Start at the beginning and add the second set of lines and then the third set.
You could stop here because you have the interweave and it's a nice pattern already. If you want the extra 4 sides, now is the time to remember the trigangles. Find the two sides of one half-triange and use them as a guide to complete the point. Then do the same for the remaining three triangles.
Try to keep the lines from each repetition the same length, but don't sweat it, especially at first. Get comfortable with the pattern before you go for precision, or you'll just end up frustrated.