Yep, you can do this. My recommendation is to starch the heck out of the fabric and be very careful when ironing it. Remember, you need to press and not iron. Ironing is scrubbing the iron back and forth across the fabric, which can really distort any bias edges. The starch will help keep the triangles in their proper shape. Also, when sewing them together, don't rush. The faster you sew the easier it is for the bias to stretch. Just keep at a fairly slow but steady pace and it should come out all right.

Starch! Lots of lovely starch will help keep the blocks from stretching.

Oh thanks so much! I am now looking forward to jumping in tomorrow!

You can do it. After finishing all those you will be a pro.

My very first quilt was all half square triangles and I sewed them all together. I think it is still the best quilt I have made. (My avatar pic) I just wish I had made it a little larger, It just fits the top of a full size bed with maybe a 4 inch overhang. It really isn't hard. I chain pieced, pressed and snipped the threads between after pressing.

I now make perfect HST every time and it is so easy.
Quilt in a Day has a triangle square up ruler that you only need to make one cut to square up your triangles. It is the best investment I have made.
I have tried many different methods and have a drawer full of them and none work as well as El Burns method.
Try her website for instructions.
http://quiltinaday.com

Have you ever considered a Wonder Cut ruler? No measuring; just cut on the lines they tell you. And, only two seams to sew, both on the straight of grain, so no bias edges to deal with. It was about $14 when I bought it (on line) -- I am no longer afraid of doing HSTs. Also does a nice job on QSTs, too.

You may like using Thangles to make HSTs. I like them when making small HSTs. There are so many ways to make them and different rulers and guides to use. One tip when using the draw a line from corner to corner square method, it's faster to fold and press the square and use the pressed line as the guide.

Go slow. Two at a time, thats all. Think small and the big thing gets less scary. You will do just fine.

Thanks for the vote of confidence. I tried one starched a few minutes ago and it worked out fine!