One of the key challenges in any sport or physical endeavour is getting used to new movements or body positions. It goes beyond the physical. The mind is trying to comprehend many things at once. The brain is making new synapse connections, and storing new information. The body is using muscles that you never knew existed, and so on.
Therefore it may seem like a very confusing time. However, don’t give up!
It takes some time to learn anything new, so give yourself some space to make some mistakes.