:D Oh hey that is one pretty coat. Take your time with it and enjoy each step. If you are unsure about anything, practice on something else first. Then you will feel more confident working on your project. Make sure you use a topstitching thread and a good sharp needle when ou get to that part. It makes a difference.
I am very excited to see your new coat. This is way cool, a new designer! I like your ideas to make the pattern your own. I do that all the time. There is a thread over at the pattern review site that talks about making home sewn clothing look more like "store-bought". It is a good thread, if you have time to read it.
Most of all.... Have fun with it! Nobody dies if it isn't just perfect.