I use what is probably equal to the stop/start button but on my Bernina I can choose whether I want to stop and go with my hands (go as my hands start moving & stop as they stop) or have the machine stay running. It's probably the same idea but I can keep my hands on the fabric where I need them. And I do always choose the stop/go option because I feel like I have more control.
I also on occasion do something no one else here has mentioned. I apply and draw on Glad Press-n-Seal for positioning motifs between meanders or loops to get them right and exactly where I want them. I'm somewhat new to FMQ so I need all the help I can get. The plastic comes right off after quilting over it so it works good for me.
It IS true though, it's a matter of practice, practice, practice. Keep at it!