I usually make a muslin if the pattern is new to me. No sense wasting fabric on a dress that doesn't fit--I've had that happen way too many times in the past.
I lay out the pattern carefully, making certain to align the grain of the fabric properly.
After I have everything cut out, I make my tailoring marks and then remove the pattern.Then I arrange the pieces in the order I'll sew them together. I'm very organized, yet somehow stuff keeps getting mussed up and sometimes ends up in a heap on the floor.