Rich,I would guess I'm in a similar place and another vote for gulls as a practice "target" I find another benefit with them is if it's bright I also learn about getting the right exposure and not blowing whites,my biggest problem is just getting out enough at the moment very frustrating..... bloody work.
As a new guy i'm trying to concentrate on certain areas: the first is to mount the camera bloody fast and be spot on with the subject in the viewfinder,I figure if I can't get that bit right then i'm never going to track something. Second is operating the shutter without pulling,this can be done indoors corner of a room say I then extend that into trying to follow say a gutter outside, I know this all sounds a bit nutz,but hey somehow I have got to get this better and if I work dawn till dust and get one sunny weekend day I wanna have got some form of familiarity in before I chase the beasties and mess it all up again.
Rich I oft read of the importance of locking your arms in to aid in steadyness but I have a gut feeling I should ponder what my feet are doing more if. I'll try and illustrate: if one has a bird flying in from the right I reckon your left foot should move before anything else away from the bird a bit so aiding my swing and balance,I have no experience of big tripods/gimbals and little with a bigish lens which I hand hold, and I absolutely have not mastered this. But if you haven't got your feet right I can't see one being steady enough to get that sharp shot on something moving while panning.Oh also practice operating the shutter while keeping that smooth swing don't stop the swing to press the shutter. this was driven home to me recently when a cock phessie went up and across me so close to be frame filling,i'm sure in that span of a few seconds I stopped my swing, the result I cut the front half of his head off(bloody gutted) .This was fast mate seconds to react ya know what they are like an explosion of speed,I was utterly unaware of him being focused up on a reed bunting.
So those are the base areas i'm trying to attack to improve from a beginner mate. The biggest thing I think is one is building muscle memory with practice practice practice,so when that bloody kez drops out of the sky the tracking is instinctive, it has to be there is no time to think. Ha that happened to me yesterday much to my amazement I kept him in frame, I don't think the tracking was as smooth or spot on as it should have been,but I am slowly getting closer.LMAO, naturally I made a complete balls up of the exposure but hey if it was easy it wouldn't be so rewarding when one gets it right.
Rich again i'll stress I'm in no way competent at this but sometimes someone learning going through the same problems might be able to share those,something here might be of use.
Oh mate you are not alone in being frustrated,I so understand that..... keep trying buddy that is what I tell meself I don't think this is easy for many,but as with all things the more one does the better one gets. Most of the time I look at what I take picture wide with dispair,I have a wonderful camera and lens and utterly no excuse. I'm very lucky to come to this with a little bit of a skillset feildcraft wise so get the chances and almost always blow them.There is only me that can change that though
good luck kiddo
Stu