Hey!
I just wanted to throw in some support because I just finished my first quilt ever and was super happy with it. I have no sewing experience, except for the quilt I just made (bought a sewing machine off of craigslist for $75). I followed this tutorial
https://www.youtube.com/watch?v=wMWQABZwis8 to create mitered corners, and they came out really well, seriously. I was going to use this tutorial
https://www.youtube.com/watch?v=F1CuzT9nMCw before I decided I really wanted mitered corners.
This last month I have learned a lot about quilting, but the biggest lesson is to just jump in. Do it. Find an online tutorial you like that makes sense to you and then Take it 1 step at a time.
You can do it!