Since you are a Texas resident, you'd need to find out the Texas requirements for a legal name change. Gender marker change for passport and Social security are federal and have the same rules for all of the USA; look on the web site for each. Basically, they want a letter from a "medical provider", the Passport website has a sample letter. Drivers license rules for gender change would again be Texas.
These are probably the most urgent ID changes you need, especially the passport and Social Security changes, since the incoming administration may change the requirements. Our local attorney recommends getting the gender marker change ASAP, even if you don't have a name change yet.
Birth certificate name and/or gender change rules are set by the state you were born in (Delaware), it doesn't matter where you live now. My experience is that people rarely ask for a birth certificate -- when I was told I needed it for my name change, I couldn't find mine and had to order a new copy.
I would suggest going to your local LGBT center and ask for recommendations for legal help. Especially at this time, there should be low cost or free legal aid available for name and gender changes.