Honestly because you can sew, this will *always* be the case, I'm sorry to say. Just wait until you start picking apart issues with RTW dresses and modifying them is just what you do because you wouldn't be happy if you didn't "fix" them
Pattern drafting is really not that hard, and if you have a dress pattern you like it's easier to modify things from there than starting from scratch, but if you have someone who can even help with that part, there's no reason to hire someone else to do what you can easily do. Often times "professional" seamstresses don't have better sewing skills than the average person, they've simply developed a business (particularly locally) because they conveniently fill a niche.
Ha ha! You must be speaking from experience!
I am pretty new to sewing. Until a few years ago, I hadn't sewn in years and the only article of clothing I made was a sweatshirt in the 7th or 8th grade! When my daughter was a baby, I tried to make a dress for her. My sister in law made it because I became too flustered! LOL! Not long after dd started competing, I got the ever so brillant idea to make her a dress. I got as far as a bodice and the panties and stopped. It took me another yr and a 1/2 to attempt it again. The only reason I gave it another shot was because my mother was going to help me. That dress took me 2 weeks to finish. The next dress took just a couple of days and before long, I had made a couple more dresses. A yr later, I bought a serger. LOL!
I agree it is pretty easy to modify a pattern. That is actually what I did with the dresses I made for dd's programs. The freeskate dress was my favorite. I modified a basic pattern I had. My dresses are very simple. I've actually drawn up a design we might use for her new dress. Dd and her coach liked it! It's a pretty simple design. Dd wanted a dress with ruching. So... this one will be my first attempt at ruching!! Thankfully, another mom canhelp me with the ruching. I'm tossing around color ideas now. grays, black, green, the suggestion of pink might work. We'll likely go with a colored mesh over a solid color. Hopefully the dress will turn out like I have it pictured in my head.