The information you've received here is absolutely on the money (no pun intended). I wouldn't recommend a rent-to-own deal to anyone, and for the reasons already stated. Further, Realtors aren't permitted to do them in Texas ... an attorney is required, and two separate contracts (one each for the lease and the purchase) must be drawn up.
I'm certain that you're aware of today's record-low interest rates ... but with that comes some more restrictive qualifications. 100% financing is no longer available ... 3.5% on an FHA-insured loan is about the best you're going to do. In terms of dollars, let's take $150,000 as an example ... you'd need $5250 down plus closing costs. We could negotiate some seller contribution to that expense, but you'd still have to come up with the difference. My rule of thumb is 6% to 8% of the sales price (including the down payment) for such transactions, subject to slight change in either direction, depending on the terms.
As noted elsewhere, your first step is to contact a lender, so that you may determine what qualifications you meet, and which ones you need to work on. I always recommend a credit union, since their closing costs tend to be lower. There are also some excellent mortgage brokers ... I work with several, a couple of whom specialize in first-time buyers. Avoid the big banks ... they tend to be totally inflexible, and their charges are higher.
I know you're looking for encouragement ... but you must first be aware of the ground rules before moving forward. If I can be of any further service, please feel free to contact me at (713) 213-6350 or ... firstname.lastname@example.org. I look forward to hearing from you.