New to sailing can mean a lot of things. New can mean never been on a boat, only sailed with friends, a year or so sailing small boats, that you've completed entry level ASA courses or that you've completed a comprehensive sailing course such as "Fast track to cruising." Can you tell us how new you are?
South Florida to Houston is going to be a challenging trip if you don't have much experience. It may get a lot more challenging depending on the age and condition of the Catalina 30.
Having a survey will help. But any time you buy a used boat you have to assume things will break on the trip home. Bringing our boat home we blew out the halyard attachment on the jib, experienced engine problems and had problems with the head. All were related to the boat sitting unused for two years. I'm a McGyver type, but would have been much worse off if I hadn't made that trip with a friend who is an experienced sailor.
If you're a true beginner you may not be equipped to deal with breakdowns by yourself. It's much easier (and less expensive) to recover from mistakes and breakdowns when you're near home rather than in a channel in the Intra Coastal with a barge bearing down on you.
Consider it will take a LOT of time to make this trip at five knots - even longer if South Florida means Florida's east coast. Can you take that kind of time off from work? It will also be expensive (meals, fuel, repairs, lost wages).
Do you know how to navigate, how to read a chart, recognize buoys, deal with storms?
Here are a couple of things to think about. Catalina 30's are very good boats (I have one). Because they're good boats Catalina sold a LOT of them. Is there something that really sets this Florida boat apart from local boats in Texas that makes it worth the trip.
If the answer is yes would it make more sense to have the boat trucked to Texas (financial, safety, time). If the reason for making the trip is personal, is there an experienced sailing friend who can make the trip with you? Have you thought about hiring a delivery skipper who could make the trip or even the first leg of the trip with you?
Whatever you decide I wish you luck with purchasing your boat and hope you're sailing her for many years.
Jim