Absolutely yes.
Even using a blind is not so easy. Birds are clever creatures. As an example, photographers have to enter in two persons and then after a while one leaves the hide so that the bird think the blind is empty, it seems!. The manoeuvre has to be repeated every day. The photographer often remains in the hide until night.
There are more favourable situations, though, where the birds are accustomed to human presence, such as on fixed hides in parks. I remember a birdwatcher hide in the Riserva Naturale di Macchiagrande, Rome, straight over a pond, where a Falco di Palude (Circus aeruginosus) was going around at comfortable shooting distance and many other birds were easily visible among which an Airone Rosso (Ardea purpurea), it goes without saying I was without a camera and it was backlit anyway). When I was younger I tried to do some of this kind of photography (my hide was my green car with the rear door opened) and I can attest it gives the "shiver" (just like birdwatching in general).
Another example is being lucky enough to have a garden in the countryside, set some natural perches and having a camera constantly aimed at the perch. Having the habit of sitting near the camera reading books helps.
