I was a swimmer growing up, so it comes naturally for me. Now, my DH just learned to swim last summer. He couldn't do 25 yds without almost drowning- literally (and having to stop halfway and hang onto the lane line to catch his breath). He took a couple swim lessons, and practiced his little heart out. This summer he did a 1/2 IM. He almost did as well in the swim as I did.
Like Teigyr said, you haven't developed bad habits (which are difficult to correct in swimming), so all you're learning now will translate into an efficient and strong stroke. Good for you for tackling the swim- you're going to do GREAT next season!!!!