From the Texas BON Website. I suggest this is one of the first things to do:
"An applicant educated outside the United States must provide the Board with an original Credential Evaluation Service (CES) Course-by Course report prior to being approved to take the NCLEX examination. The documentation must be sent directly from the approved CES organization. The Board accepts the CES from the Commission on Graduates of Foreign Nursing Schools (CGFNS), the Educational Records Evaluation Service, Inc. (ERES) or the International Education Research Foundation, Inc. (IERF). You may access this service by going to one of the following websites:
www.cgfns.org,
www.eres.com or
www.ierf.org.
I have decided to use CGFNS for my fiance CES. Price is 16,000 pesos or $378. I found CGFNS very easy to use and a good website to help you track your process.