checking your plane

can anybody help me, please!

I feel the my set up is finallly correct and have studied how I should swing from face on, i feel that things are in order and the swing and timing has improved.

now I wonder how can I check my plan? (is it only by filming myself)

I have a feeling I am swinging sometimes inside-out and sometimes outside-in, how can I get my swing plan in order? I somehow dont feel that, I only know at impact that I havent hit scare and then of course by the ball flight I know I havent correctly hit the ball. As I try to correct my thoughts I swing all over the place.

Any advise?