Dear Vetgirl
I had a 2-stage revision of my hemi-arthroplasty, because of infection, in October and November 2012. I certainly would not presume to give you any "advice", as all our cases are so different, but I would definitely say that, in the whole scheme of things, for me it was no major deal. Josephine will correct me if I am wrong, but as far as I can make out these operations are not intrinsically more difficult than the initial surgery.
Bizarrely, although the infection was found to be very severe, and I had to have extensive bone grafts, I was only ever aware of very minor symptoms. A hip arthroscopy came up negative, various blood and other tests were only at most borderline, and even - extremely expensive - nuclear medicine only gave an inconclusive result. From the first suggestion of a possible infection, to making plans for the revision, was over a year.
To answer two of your points from my experience...
1) I was a private patient in a UK hospital. Protocols may well be different in Oz. As regards staying in hospital for the IV antibiotics, I did have that option. But I was anxious to avoid that, if possible. Here, sometimes it can be arranged for a patient's local health provider to come out daily to do the procedure - but my local authority were not playing ball with that one. So in my case I went into hospital daily for 2 weeks. It was an hour journey there, often 2 hours in the hospital (as I have titchy, wriggly veins), and another hour back. Worth it to me, though.
2) Weighbearing with a spacer? Please be aware that I have zilch medical knowledge, and everything I tell you is just stuff I picked up along the way, but as far as I can make it out there are 2 types of spacer. With one you can bear a certain amount of weight. For whatever reason my surgeon chose one which does not allow weightbearing. I have every confidence in him, and really, who am I to argue? I actually liked the crutches, though I found stairs very difficult. Other people seemed to master this much quicker than I did.
Overall, a 2-stage revision, in my experience, is not a terrifying, painful and scary ordeal.
The biggest downside for me was tiredness. I remember the first time I went out on my own, after the second op, when I was on two sticks. I drove 20 minutes to the shops, had a pedicure (I still have trouble bending), did 2 more errands, and drove home. I was exhausted. I think the tiredness is just something you have to work through. I don't know of any magic short-cuts through it. You're young. You no doubt have reserves of energy which long since abandoned me.
All the best. Think of it as an adventure... Sort of.