Preparing to change black dump valve

[The Colonel]

2017 FC FB. I’m preparing to change the black valve due to leakage past valve. I’ve tried other remedies with no success so am going to take this on. I’ve cut access around valve to where I believe I can get to the four bolts/nuts. The shaft appears to bea straight extension with a rivet connecting. The valve is a valterra and I have a replacement on hand with the two seals. My question for anyone who has changed this valve on a model like mine is, how hard will it be to separate the plumbing once the bolts are out to remove/install valve? Any other advice Appreciated. We are living in AS full time for now so I know it’s going to be a challenge. Planning to send wife to daughter’s over night to flush out tank and let drain as much as possible.