1. Find a park with lots and lots of snow. It helps if there was a giant blizzard the last two days. It also helps if the park is right next to your apartment so that you can run back in whenever you need to get hot chocolate and extra socks.
And after 1.5 hours, even if the ball is still no larger than your head, take a break and drink some hot cocoa. And then get back out there and start rolling again. Continue to taunt the boyfriend about how your snowball is larger. Ignore him when he notes that his snowball is actually a sphere, whereas yours is a strange lumpy asteroid shape.
6. Put the snowman together. Realize that the torso ball is still too small. Pack some more snow in until it is the appropriate size, or until you realize you can't feel your toes anymore and you really need to go back into the heated apartment. Whichever comes first.
8. 6 hours later - try to wipe off that giant smile on your face when you see little kids taking pictures with your pretty princess snowgirl-snowman.