I know that those of us who have been doing this leather work have been talking around those who don't. So I wanted to give you some idea of what might be involved to try holster making. It takes very little to get started. The first picture is most of my basic leather working tools. All of the holsters shown in this thread so far could have been made with much less than this. Only a few of the other necessary tools are not shown, such as a couple things for setting snaps, or sewing needles, etc. But here it is, and I'll cover a few basics.
The long handled chrome plated things are what you tap into moist leather, using a rawhide (shown) or synthetic mallet. The work is supported on the 12" x 12" marble base on which the tools are sitting...very cheap...stone surface on one side and 1/4" thick linoleum-like surface on the other. It's a standard item at any leather place.
The piece of scrap leather shows where I tested some new stamps over the years. The cheap nylon (or wooden) pulley wheel is to rub across edges of damp holster leather, to burnish and radius them; simple and effective.
The three wooden handled star wheels are what you roll through the seam groove along the edge of a holster, in preparation for stitching it; large, medium, and small length of stitch. I also use them for decorative purposes, to make it look like stitching when real stitches are not necessary...or when you use leather adhesive. It is a very realistic effect.
Beside the left side of the leather triangle is a tool used to mark how far in from the edge your stitch line will be, while cutting the groove as you slide it along. Alternately, you can use the tool beside it, to free-hand cut a stitch line...or do all sorts of decorative work.
Lying across those two tool handles is the stamp tool for one size of basket weave design; I do several types.
Looking at the tools in my tool block, you get the general idea. Some are to be stamped, some are to be gently pressed and molded, and some do things hard to describe. But you can really let your imagination run wild.
There are hundreds of these stamps and forming tools. See the Tandy Leather catalog. It's all about using them creatively, in combination, and the possible combinations are endless. Most have been standardized for a hundred years or more. You can find ancient tooled cowboy holsters from the 1880s with stamped designs where I immediately recognize some of the tools from my own collection. Same applies to saddles, belts, and everything made of leather.
The Tandy stamps tend to be greatly overpriced, in my opinion. And it's so much fun the tendency is to buy lots more than you really need. I know you gun guys would have trouble understanding that.

This is where it can be useful to have an experienced leather craftsman in your area who can help you get started by telling you what basics you actually need, and what can wait. I didn't, and I have things I have not used in 27 years of leather sniffing.
Anyway, I hope this convinces some of you that it is not so difficult to get started with leather. It's also a great hobby for apartment or trailer dwellers, with very limited space.
To put it into perspective, for the price of two or three high quality holsters, you can probably buy enough basic leather gear to get started. Then you may never buy a commercial holster again. And you can add tools and stamps as you discover the need, budget permitting. It really is a useful and fairly simple skill to master, for anybody heavily into handguns...or just keeping your pants from falling off, with all the beautiful tooled belts you will not be able to resist making.