I just started with hummingbird photos this weekend (hence the feeder image) - to put it mildly I have no idea how everyone is getting such great photos. Our one resident Ruby Throated is so skittish that it spooks if I bat an eyelash sitting inside our house 6 meters away so these are heavily cropped. Anyway, lots to learn. Not helped by the fact that animal subject detection insists on finding some sort of animal face in our red glass feeder
FWIW, I don't use any animal subject detection modes even when shooting mirrorless but use a focusing mode like a mid sized Dynamic AF Area or the Large or Small AF Area mode (or Group in a DSLR) and position that in the viewfinder so it's a bit up and away from the feeder or flower so the AF doesn't latch onto the feeder/flower. After each sequence I'll refocus on the feeder/flower to get the focus close but position the camera so the feeder/flower is along the edge or in the corner of the frame and wait for a hummer to come in, feed and then back out before trying for a shot as shooting as they approach tends to scare them away(especially with DSLR shutter noise) but if they feed first they seem a bit more tolerant.
With a flower I'll sometimes take the image while the bird is feeding but usually wait until the bird feeds a bit and then backs up and away. They don't always hover there but they do that often enough that I can usually focus and capture a few images.
I've tried simple blinds that break up the human form like hanging a sheet between two stands and just standing behind it and have sometimes set up feeders just outside an open window and used the house as a blind. But most of the time I just stay quietly near the flowers or feeder I'm working and in time the birds come in as long as I don't make a lot of sudden movements but something as simple as letting the camera hang down and then raising it to my eye as a hummer flies in is enough to scare it away. So if the birds are particularly active I might hold the camera up in shooting position and wait, if they're less active and taking longer between feedings I'll use a tripod to stay ready but the latter assumes I'm working a specific group of flowers or a feeder and not moving around as the birds feed around a wider area.
Placing a feeder near some flowers and letting the hummers get used to coming into that feeder and then removing the feeder and placing a few drops of sugar water on the flowers is one way to get them coming and feeding off specific flowers but often I just see which flowers they seem to be visiting frequently and set up near those flowers.