Hello Yankeeman,
Thank you for the review. I am glad to hear you enjoy the style of this Delta Shower. We would agree that, without previous experience with soldering, it is recommended to consult with a professional. If the trim is being updated on a similar Delta tub spout that uses the same brass adapter (RP12307), then installing this trim kit should be fairly simple.
https://www.deltafaucet.com/parts-product-detail?modelNumber=RP12307
Best regards,
Edward