I don't always get it right the first time. Sometimes no matter how much I try I never get it right. That's all part of life.
To show I'm not perfect I'm going to put my mistakes out there for all the world to see.
First mistake was when I had decided to use iron on vinyl on wood. I had never done it before but not a problem. I looked for the time and temp needed. I painted my wood piece and added a sealer. Let me just say here that lack of patience is my own worst enemy. I failed to let this dry long enough. My mind told me that it was dry to the touch so that was good enough. I found out otherwise
Not only did the vinyl not stick but it made a terrible mess of the paint and sealer. I had to toss the whole thing and start from scratch.
The second mistake was when I made a cell phone bag for myself. I had already done 7 of these and could get through them without constantly checking the directions. I don't have a picture of the error just the finished bag.
Thankfully my mistake is not noticeable. There are two inner pieces and when I put them together to sew I had one panel facing the wrong direction. That means that you can see the backside of one of those panels instead of the front. It only shows on the inside middle pocket and the sides. Thankfully I did not make this mistake on the bags I did for orders. The worst part about this mistake is that when I was pinning the two panels together I questioned if I had it right or not but then decided I did instead of going to check the direction. Live and learn.