I always try and make my seams a scant 1/4". When you add the fabric fold over and thread, it equals 1/4", but for learning, it's more important to be consistent and have straight lines and when you've mastered that, you can work on the other...enjoy the process...this is your work and you should enjoy what you're doing! No quilter starts at the top...we all started somewhere and work on improving our craft over time...have fun with what you're doing!!! :)