I can only tell you what I do. I just keep wiggling around as I am moving around. Just keep filling in where it looks empty. I also tend to do one block at a time and just move on up the row.
Practice on a sandwiched practice square first to get comfy. Your machine should be moving kinda fast and you should be taking your time moving the fabric. Especially going around corners. Don't be in a hurry. You May have to play with your tension a little bit too. That is why you practice first.
I hope that helped and I hope that made sense.