It sounds like good progress, it's good to be active, but stay within yourself.
You're healing at two levels, one is much more important than the other.
The first is healing the bone to the device. You want to do everything you can to support that. That takes a good six months, from attaching the bone fully to the device to making the bone stem stronger, to just overall bone strength.
That's the most important thing, and that can be strengthened by gradual exercise like walking, riding the bike and any others recommended by your doctor. The important thing to me is to do activities that make the joining stronger without putting so much pressure on it that it starts degrading the junction.
So it's a bone - device thing.
Exercise of the right type and intensity helps the healing, but time and patience is really the important thing. Especially for the type A personalities that we have here. It was the hardest thing for me, especially when I felt muscularly so much better, and the pain was so far away.
Once you're set (pun intended), you can start on getting your muscles back in gear. I really started on working out hard when 9-10 months rolled around. Others have begun earlier, some later. The time doesn't matter as much as getting back to full strength at the right time for you.
I used physical therapy from week two to five (at home, very light), week five to twelve (outpatient, more active), then hired a trainer at my gym for a month to help me sort out a good workout regimen.
As to sock on - I used my sock putter onner device, that worked great for me. I think I started doing it al fresco (without the device) at about twelve weeks.
So I think you're right on track. Just downshift when your body tells you to, this is something where you don't run through the pain.
Sounds like you're doing well, keep it up...