I've just started longarming. As with quilting, we all had to start somewhere. We all learned different techniques, & gained in our knowledge as we did our quilts. We all found our niches that we really enjoyed doing also. In Longarming, we go through the same process. We learn with each quilt that we do. We gain experience & are ever improving on our techniques. Each with have their own niche. I'm about to start quilting for others & am fearful of some of the quilt tops that are going to come my way. I've seen, already, quilts with major issues on other longarmers machines & know that I too will be faced with them. How am I going to go about resolving the issue? Communicate with the quilter on the problem. Let the quilter decide what they want done to the quilt. I know that since I've started longarming, I've become more conscientious of my own quilting so as not to have issues when I get to the frame. Certification? No. there are too many variables. Human factor plays too important a role here. What is that saying? Only God is perfect, but our quilts don't have to be? But we do strive for the best we can.