Manual focus is not that big a deal. But in video yes. Its very tough to manually focus in one smooth movement. Because the very nature of the focus ringand the fingers moving on them. The focus will move jerkily. There are ways to get around this by buying some additional gear for it like a follow focus. But the cheapest ones cost an arm and a leg
. But its not impossible to do. + you have to get used to Anticlockwise = focus farer and vice versa. Once it becomes 2nd nature you wont get confused. But still i dont think any amount of practice will ensure long distance smooth zoom ins and zoom outs as ive experienced.