My 84 year old widowed mother died last November and left everything to me, her son as her primary caregiver, in her will.

My condolences on the death of your Mom.  Provided that the Will complies with the Texas Probate Code, you should have no trouble at all probating her will and if there are no problems, it should all be completed within a few months.   You will need to file an Application for probate within four years of her death and provide the statutory proof to the Court for probate and issuance of letters testatmentary or of administration.  Please take the Will to a lawyer who practices probate law for advice on how to proceed after they have reviewed the Will.