Mary, have you tried Clover Fork Pins? They make lining up seams so much easier. Take it from a blind quilter, my seams would be 99% worse without those pins.
I also like some mistakes. When looking at an old quilt, the mistakes or imprecision of old cuts seem sweet to me.
If you work on a sampler quilt, you might appreciate being able to see the growth of your skills as you progress.