I am feeling your pain.. I just keep trudging on..It's funny, two of the hardest things for me were- cutting a straight stip..This was partly due to the fact that my self taught cousin was teaching me how to fold and square up fabric and nothing was coming out right..After many youtube vids I found out she had taught me that the salvage edge was actually the raw edge lmao. It took me forever to over come that mental block!And all though my techniques are getting slowly expanding.. I stilllll struggle with sewing a striaght 1/4 line even with a 1/4" foot(laugh)..I'm praying my new machine will give me an edge over this problem..
Just keep watching all the how to vids that address your problem areas and ask lots of questions..And it doesnt hurt to practice stuff on a smaller scale until you tackle it. A wonky binding on a tablerunner would not be so crushing as one on a quilt you've put eons of time into..