@Irelandliz, I bought one of those floor pedaling gadgets and found it to be an "exercise in frustration." It moved across the floor no matter where I put it and even if I wedged it up against the wall it would move. It was also very difficult to find the appropriate sitting position for it. The chairs and sofas all were either too high, too low or....whatever. It just wasn't for me. As a result, I purchased an upright, exercise bike, on the recommendation of my PT and I love it.
I transitioned from the walker to a single crutch and then a cane. I continue to bring the cane with me if I am outdoors for a long walk....just in case.

Walking outdoors is so much more hazardous than indoors, with lumpy surfaces, hills, tree roots, gravel, acorns, crowds of people, dogs, or cobblestones. And city sidewalks are a mess around here! I'm fine and cane-free in stores, but I keep a cane in the car and just carry it with me for longer nature walks. Paranoia runs deep, lol.
If you find that you are limping, than you should revert back to the walker until you can use the cane without limping because good form matters, a lot! Learning how to walk properly again is just that; learning! Who knew, eh? Most of us, self included, have been limping for so long and also walking with bad form it's just what we naturally revert to, especially when tired.
Just for informational purposes, I only went to PT 2x a week, Mondays and Thursdays and tis obviously allows for two days off. That seems a good fit for many here. I also pretty much never did the home exercises, lol. But, as I said earlier, I have a house full of stairs that I can't avoid, so in many respects, that was my additional PT along with walking, and just some gentle stretches at home. My husband was also paranoid about my lack of formal exercise at home, but he's come to see the wisdom of "Less is more." When I get my other knee replaced, if I can't find a PT like the one I have now, I'll just rehab myself at home. With an exercise bike, some stairs, and two little dogs to walk, it should be fairly simple, though I would miss the massages and the great stretching I've been given at PT. He's also helped me with back and hip pain that became exacerbated from the tkr, all of which threw my gait off kilter. Hopefully, I wouldn't have that issue again.
Hope that helps!