I've always said---only half-jokingly BTW---that the average worker can forgive anything but another worker who's risen from the ranks!!
I faced a similar situation years ago when I took a job on a med/surg floor where I'd worked as a CNA during nursing school. All the aides were women I'd worked with on the same level, and I admit it was pretty awkward at first; some of them tested me by 'accidentally' being unavailable when they knew I would need them, or they flatly ignored me when I asked them to do something. But over time, they realized I wasn't abusing my position or asking them to do anything I wasn't willing to do myself, and even when push came to shove, I always dealt with it myself rather than running to management, and I never treated them with anything less than respect.
To this day---even though I've since left that position---the CNAs on that floor will tell you that they loved working with me, because I treated them as equals, didn't talk 'down' to them, and worked just as hard as they did. There are even a couple of aides who were essentially worthless, but I could always get work out of them by killing them with kindness........it's all in how you approach them.
You'll do fine, just give your co-workers time to adjust and LOTS of encouragement. Nothing helps make an aide's day brighter than a "Thank you---you did a great job!" or a "Nice catch on that BP---I might not have noticed it if you hadn't told me".