The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants. -Thomas Jefferson.
That said....what is being contemplated here is not a rerun of 1861. We are talking about a gathering of those states that would like to return to Constitutional government and thus preserve the Union that was established in 1787. The states who do not wish to join that endeavor, may feel free to abstain...though admittedly...a few states are not invited to remain with us...California, Washington, Oregon, Illinois, New York and a number of New England states (although counties within those states could certainly send representation to this convention). Again, this is not secession...it is renewal of the original Constitutional contract.
Texas needs to call for a Constitutional convention and invite the states it deems still willing to return to "originalism"....In this convention, steps would be taken to restore the Constitution, not to break from it. Perhaps locating a new national "Capital" (my vote goes to Dallas but Kansas City might have an argument as well), establishing stricter rules both for citizenship (eliminating the "anchor baby" baloney for example) and voter ID verification procedures to ensure the vote of EVERY legal citizen counts and that none are disenfranchised by fraud. Re-affirming, of course, the electoral college.
This convention, after affirming the constitution with some minor corrections...example: eliminating the pre-amble clause of the 2nd amendment to clarify that the right to bear arms may NEVER be infringed/eliminating the income tax/establishing a pro-life position, etcetera...and most importantly I would add an amendment that clearly states "All men will be treated under the law according to the content of their character, not the color of their skin."
After locking in our updated Constitution, this convention would then proceed to organize national elections. New House and Senatorial elections would be held as well.
Once this updated Constitution is affirmed, a new government can be formed...as the new NATIONAL government of the United States of America. Membership by invitation only.
Yes...this is dreaming a bit. But I think the answer is not some sort of secession followed by military actions. That would be self-destructive and horrific even if won...more importantly, WE must remember that WE are the legitimate government and citizens of the United States and WE are the legitimate heirs to the Founders and the Constitution they created. It is not US who needs to secede...no....this would be more of an excision of states gone rogue...Cali, Oregon, Washington, NY, Illinois and a number of far Northeastern states.
Lastly, as Texas is leading this great movement....let's just go with the already coined term TEXIT.