Hummingbirds will tolerate your presence closer than most birds so expensive long lenses are not necessary. I shoot mostly from 10-15 feet.

When looking for a feeder check how they separate and avoid any that separate below the fluid level as these will often leak. Red is the preferred color. One part sugar to four parts water is the recommended mixture. Avoid prepared solutions. Clean and replenish about once a week for best results. No need to boil the solution as part of preparation.

Select feeders with out perches or remove them. This won't affect the birds at all...flowers don't have perches.

Best season for hummers is mid to late summer. Time of day depends on lighting conditions. Flash is OK for poor light but you will be hampered by recycle times. They don't seem bothered by flash but natural light is preferred.

Camera settings is up to you as long as you maintain a fast shutter (1/1000 approximately) and sufficient DOF. Camera's highest frame rate is best. I prefer spot or center metering...be aware the camera wants to focus on nearest object to the camera so stay on the bird.

All the birds have one feeding pattern...they will drink fly back a short distance hover momentarily and then drink again...this pattern will be repeated until finished. Short bursts at the pivot point is best.

On feeders with multiple ports block off all but one or two and position it for the best view of the bird. When framing the bird leave some room to facilitate cloning and cropping.

Post process removing any unwanted objects in the frame and crop to the desired composition.

Cameras with higher pixel counts provide to most flexibility for this technique.

This is how I do it, others may have different methods. I hope this helps to enjoy the little jewels.