I have been working on my bird photography skills for over a year now. I generally use a "hide", I use the term loosely as a hide ranges from my office window to my vehicle to a mossy stump in the woods. I always assume that if I see the bird it has seen me a whole lot sooner. The key is to acclimate the bird to your presence. Approaching in a straight line, eyes locked on your subject has NOT proven to be a successful tactic.
I vary on finding birds. One tactic is locating suitable habitat, locating signature species, getting comfortable and simply waiting. In my neck of the woods, chickadees are very vocal and alert other species to your presence. When I hear and see chickadees, I find that stump and quietly sit until the chickadees begin to ignore me, soon other birds show up and the fun begins. On the other extreme, I will locate a specific bird and pattern its behavior. Since late February, I have been monitoring an eagle's nest. Today, I have seen both eagles at the nest. The upcoming pictures will be far from accidental.....I know where I will position my car and at what time of day. I will have the opportunity to actually capture the shot that I picture in my head.....hopefully A third tactic that I work on is building a bird friendly backyard by planting trees and shrubs that provide food and shelter, providing nesting boxes, adding a bird bath. My hope is to provide attractive backgrounds for photography as well.