You guys will do fine.
Pay attention to your vet's restrictions and follow them to the letter. Truman will protect his bad leg, it's up to YOU to protect his OTHER leg, which will bear the brunt of two legs as he compensates. Keep him on leash, all the time, whenever he's not crated. I'm sure you're aware that 50% of the cases require a second surgery to correct the other knee, usually due to owner's not following restrictions.
He will get a little "cabin fever" and it's up to you to mitigate that and keep him as low key as possible. We gave a ton of tramadol for the first few weeks just to make sure Connor was as comfortable as possible. Ace is not a great idea, as it creates a LOT of uncoordination/confusion which isn't a good thing in a three legged dog trying to protect a fresh and painful surgical repair.
"My first priority will be to reinstate the assault weapons ban PERMANENTLY as soon as I take office...I intend to work with Congress on a national no carry law, 1 gun a month purchase limits, and bans on all semi-automatic guns."-Barack Obama
"When in doubt, whip it out."-Nuge