Give yourself permission to make mistakes and keep going. I've been sewing for several years and still do dumb things, it's just part of the process. Failure is only true failure when you give up; if you stick with it, it's just a cheap first-hand education. Learning how to deal with mistakes was a big hurdle for me, might not be for others but I see a lot of people throw in the towel on a lot of different endeavors after just one mistake.
I'd add to that to make sure you finish your first project. Sometimes we make a mistake, get down on the project, and want to start on the next project without the mistake...but you've already bought the materials, so finish it up and make the most of the education, and any additional mistakes won't hurt to bad.
And start easy, don't make your first project one of those complicated packs with all the accessories.
Run a seam on a scrap first before you sew the actual piece you need. I save sized enough scraps so I have a reference to back and get the feel for it, even fabrics I've already worked with.
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