Can't kick properly...

[pettiskick]

Check out Bill Wallace stretching videos and youtube clips. I went to one of his seminars years back and it the knowledge I gained increased my flexibility and kicking technique tremendously. Bill "Superfoot" Wallace was one of the best kickboxers ever he's the dude in my av.

[PandaJab]

I was and still am in the same position as you. I haven't perfected it yet, but I practice my kicks at home and in front of the mirror at the gym while I am waiting. I notice each time I do some bag work it I improve more and more.

I throw it at a quarter speed going through all the motions and sometimes after training I'll practice some more on the thai bag going a quarter to full speed to condition my shins.
I try to assess myself after practice and think of what I did wrong opposed to what I was doing right.

[HIMBOB]

Slow it right down

focus on getting your hips over and not kicking with the foot.