I press the seams as I go...so when my top is finished, The seams have pretty much been pressed. I then fold it as few times as I can and drap it over something where it will not be in my way. or sometimes, if I am not going to quilt for a while...I put it in the top pile awaiting quilting...OK, this is not what a lot of you would do, put when it is time to load it on the long arm....that is exactly what I do without anymore pressing unless the fold lines are very deeply creased which seldom happens as long as a lot of weight hasn't been placed on top of it. I then load the quilt, backing, batting on my long arm and prep it to begin quilting. I usually load the quilt the day before and as in the process of loading the top it does get flattened by rolling it onto the rollers, I am good to go. Saves time, and I never, ever, noted any "fold lines" remaining in the quilt after the quilt is taken off. I think of my longarm as a sort of passive "mangle" It works for me.