There are lots of youtube videos, here's one:
https://www.youtube.com/watch?v=KNxICsLAOrE
There have been several posts on this board about making your own ruler, if you do a search you should be able to find them. They provide the angle.
I have the actual tool. Compared with other tools, it's pretty inexpensive, also, because you are placing it over intersecting seams on your starting piece the feet raise it up a bit and keep it from rocking. This makes it a bit safer & more accurate (for me, anyway).
A couple of comments. There is a fair amount of waste. Don't cut too far ahead of yourself, it's easy to get the pieces mixed up. I found a large rotating mat was very helpful.

I have three sizes of the Twister Ruler and well worth the money. Have made a king size quilt using the largest one. Easy but time consuming . Love doing it

I have two of them...haven't used them in about 4 yrs...hmm, I don't remember little feet on them...will have to get them off pegboard and look..... I do remember as paper princess pointed out....waste and a bit confusing at first....I guess I wasn't thrilled with the finished product...I sold it at guild garage sale and may do that with templates at my own...just to thin out.......

I made my own template (so long ago I forget the 'how) out of a template sheet I got at Staples. It's clear enough that I just drew the lines on it with a Sharpie
http://www.staples.com/Visi-GRID-Qui...product_291894

You would have to have a square up ruler the size of your unfinished block. Then mark a line of where you want the square to line up and trim. I too agree with you about these rulers you can only use only on one particular pattern. But they are cute quilts.

You probably don't "have to" buy the ruler, or template, but it sure makes it easier and you'll probably make fewer mistakes.

if you decide to mark a regular plastic quilting ruler of the right size, and mark it, you could use come "invisigrip" or similar non-slip product on the side which will be on your fabric. The cuts you make with the Twister Tool don't leave much room for over cutting -- you'll be damaging the next row of blocks you need for your project. Think that's why the tool comes with the attached feet to keep it from slipping.

Look for the old pattern (book, I think) called Barn Dance. It has directions for doing this by making your own template.

This site shows how to make a template for the twister pattern.
http://yarn-or-fabric.weebly.com/how...-template.html
I researched it but ended up purchasing the June Tailor template with multiple sizes of squares.
Good luck!

[QUOTE=RugosaB;7160210]I made my own template. It's clear enough that I just drew the lines on it with a Sharpie QUOTE]

We made those about 7 or 8 years ago. The teacher gave us a plastic template that she had created. Most of them were for 7 inch squares, but she made a special one for me for 6 inch squares because I had hundreds of six inch squares cut, so why cut more of something else?
We placed the template on the squares with the lines matching the seam lines, drew a line around that, and cut them out with scissors. There was no waste. The little squares left from the centers went into the borders.
If you could find the correct size you want, and the correct place to draw the lines, you could make your own.