We were going to do that, before we bought a house, after multiple, multiple land sales went sour.
The thing about buying land:
IS IT BUILDABLE? It needs to have a perc (septic) test already done on it and certified and the certificate needs to be absolutely current and filed with the town records or wherever. Shady folks will try to sell you all sorts of things which are technically land, many of which are quite picturesque. However, the land NEEDS to be buildable. It must have either city sewage or a current perc certificate (will vary by state as to how that is handled exactly). If the land you absolutely must have does not have such a thing, then make the seller pay for the perc test or make the closing contingent on a passing result. Put this part of the agreement in the Purchase & Sale agreement, and do NOT waver, not for a second on it. I tell you this after many failed attempts to purchase land. Seriously. You will save yourself a lot of heartache and a LOT of time and money. Be aware that perc tests change over time: for example, one piece of land I was interested in, had previously been one large lot. It had been perc'ed at that time, and then was subdivided into three lots. Two of those lots were on the part that passed the perc test. Guess which lot they were trying to sell me...
I gather that Texas does not have the same sort of building regs as where I live. While this may seem convenient, in that you can do much of the work yourself, OTOH there will always be some things you just don't have time to do, or that you don't have the equipment to do (such as pouring a foundation), and you will have to contract it even if you are your own general contractor. In a state with tight building codes, you can make contractor payments contingent on the work passing a building code inspection, so you know the work is at least half-decent and probably won't go bad within the next few minutes. In states with fewer building regs, you're on your own, and good luck to you. You must be extra-diligent about contacting references and following up on examples of the contractor's work, checking with the Better Business Bureau and the local court dockets, etc. to make sure your contractor is any good, when you are hiring. Know your local building codes so that you know when you are in a "buyer beware" situation.
It is a lot of WORK. It is a full-time job in and of itself. I don't know that it is possible to do alone, lots of building projects require at least four hands and heavy lifting. It is approximately as stressful as the worst full-time job you ever had, and you can expect it to take a toll on your relationships, your health, and your mental state.
True story: My mother hired a house built, only to discover while they were finishing the kitchen that her general contractor was embezzling money meant to pay the subcontractors. The subcontractors promptly sued the pants off HER, because the general contractor didn't have a pot to pee in even after stealing $10,000 from her, but the subs all knew that she must have money since all buildings run over budget, right? And this guy had a good reputation with a local architect.
There's just a lot of pitfalls. Really, really think about whether or not you can find a house already built that you could renovate to acceptable levels. Seriously, DH and I looked at about a zillion houses online, we never thought we'd find something we both liked, but we love the house we finally bought.