Please don't make this into a controversey. I know browbands and everything are good, but we just don't use them, but if you want to know how, I can do that for you.
Well first of all here are pics of bridles we have around the barn with different bits.

Roping bridle with Argentine snaffle

Same bridle, but with tie-down

Now with a curb

With a curb again

Now with a snaffle

With a snaffle and a grumpy face
If you have comments or anything go ahead.... I plan on making one of my own soon, so i'll be posting step by step instructions for ya'll! I'll also get some pictures of the most used bridle.... it shows it's ability to be resized easily
Thanks for looking!
Edit: Here are the step-by-step instructions!!
First: make sure you have all of your supplies...... 3/8 inch rope, bit, electric tape, knife, lighter, ruler, (trigger snaps, optional)
Step 2: cut your rope into one lenght of 5 feet, more if your horse has a large head, and then two reins..... these can be your choice of lenght, I used 8' split reins, but you can choose the length you prefer and can even use a single rein
Now what you have should look like this:

Step 3: tie the off-side of the headstall to your bit
Start by going under, out and over, like so

Then go back in through the bit, and then under the loop you just made with the rope

Now your knot should look like this:

At first your knot might not want to cooperat too well.... the rope will get broken in though in no time, just make sure that the loop of the knot stays behind the bit like below

The offside should be taped with the electrical tape so that it won't adjust on it's own.... it also keeps the knot tidy

For the near-side you tie the knot in the same way.... the bridle will be snug at the horses poll, right behind the ears.... if you plan on using it on only one horse I recommend sizing it right and then taping that side aswell, but if you don't just keep the usual knot..... and if it is too big you can tie the knot below to keep the excess from flying around

For the reins, you can either attatch them to trigger snaps or directly to the bit...... I used trigger snaps, the secret is to make sure that your reins are as close as you can get them to the same length when they are done....
You start by folding it over what you want it attatched to

Then tape it together with electric tape, I prefer using two layers, starting with the end of the rope and going toward the snap and then back, and make sure I go past where the rope ends

Here's what the reins look like finished

And here's everything together....the near side is going kinda crazy in that pic, but i've had it hanging up and the rope is breaking in VERY quickly

Here's my homemade headstall next to one I bought

Hope you enjoyed!!