Not very good at it, but a couple of things I have found help me. May or may not be of help.
Try and get them flying towards you, or as near to as possible, they move less in the frame.
Keep both eyes open (for me that goes back to 35mm film and a "sports finder")
If the sky is bright try setting the exposure compensation to around +2/3 (don't know if it is correct to do that, but it helps to get better detail on the bird, especially when the sky is bright white cloud)
As was said, keep practising. Practice on anything that flies, aircraft, helicopters, hover flies, bees, butterflies and even pigeons. Anything where you don't have to drive far and pay for petrol and parking until you have it reasonably good
Don't let the birds know, since I got the MFT systems, gulls have not been seen here. Definitely they have conspired against me
Edit.
On the G80 try using the custom focus area, on the second or third setting from smallest to start with, that will give you an area in the centre rectangle of the guidelines, and avoid any trees etc that may be on the edge of the frame. (If you have not found that already)