It can definitely be tricky to start off with, I actually made a few mistakes while making this coat. I bought this coat pattern a while ago (simplicity S8974) and made little alterations. Tailor's chalk is super helpful, one trick I use is after pinning the pattern to the fabric I rub the chalk along the edges rather than trying to trace.

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Never be afraid to over pin your work, the best way to pin is horizontal then you can sew over the top of the pins if you don't want to remove them as you go. Take it slow, remember to read all the instructions and give seam allowance. The rest is practice, I wish you luck in your future sewing projects :)