Guy Cribb video +1
I used to be able to do planing gybes in the 90's although I don't think I got every gybe but I think the boards back then were heavier and didn't bounce as much. I used to just fly into the gybe , let the sail go and grab it as I came out. With the modern boards they seem to bounce on the chop and you need to get more technical & keep mastfoot pressure etc..
I started to relearn gybing using the guy cribb vidoe about 2 seasons ago when I got back into the sport & got a modern board. I had a lot of bad habits like not doing the step until after ( possible on little boards though) + overhand reach for the boom and not moving hand forward etc etc..

After 2 seasons I might get a few decent ones each session but generally in nice flat water and generally on my smaller board as I have kept some of my old habits & provided Im powered up enough I can switch feet on the exit.
I had one session where I got 10 in a row

but haven't been able to repeat it..

Things change all the time , a different board + sail , different chop etc..I still feel like a beginner some days..
I think if you can get out regularly , are fit and can get the same type of wind a few regularly it makes it a lot easier. Going several weeks with no wind or months without using a particular board makes it hard..
Look at the exit , bendz zee knees , pull down into the boom..Do as I say not what I do..


I think Cribby says you lose about 5kts going through the gybe ( thats him) so you have to be going warpspeed to enter..That's where oversheeting on the entry helps ( that's what I need to work on but its a bit difficult to practise in gusty winter winds where you rarely get going for long..