I was hoping to hear that your Dad's spirits had raised since your other post.
It's normal to go in and out of a kind of panic mode when someone with a life-changing injury is coming home. It's like eating an elephant...you can only take one bite at a time. ;)
If his environment is prepared at home and he's surrounded by those who love him, then the rest will be up to him. But he's eating an elephant too...so it just takes time.
Expect increased situational depression at times...something about returning to familiar surroundings in an unfamiliar body is particularly overwhelming...and I think a lot of us who are sci'd are a little sucker-punched by that at first. Just be there, remind him how far he's come, trouble-shoot with him in ways to make his life more manageable and independent.
But you're right...he will be pissed. On some days even the
word "shower chair" will piss him off. Just don't allow him to take it out on you...it's not okay. Sometimes you're going to have to put your "hard arse" hat on.
Will he receive in-home therapy? I'm hoping so...I apologize if you've already mentioned this before.