Learn the basic process for quiltmaking:
Accurate measuring/marking
Accurate cutting
Accurate piecing.
Then go for it.
It is my opinion that many new qulters just start and wing it without taking the time to learn the basic rules for good quiltmaking It doesn't have anything to do with the so called quilt police. Regardless of what craft one does, the basic MUST be learned before proceeding. You have to learn how to use meauring cups etc before baking a quilt. Why should it be any different with quilting. If you want the points to match and block end up the size to fit then you MUST learn how to do this. Read a book, Take a class
don't assume you can rely on advice from the internet because we all approach the question from our own level of skill. Do your homework first.