With focus pulling you employ manual focus and long exposures. A good tripod is a necessity! The fireworks were 5s exposures, the Christmas tree 8 seconds. 

With fireworks I think the images are best if you start out of focus and slowly rack back to in focus. With my  Christmas tree I was also zooming the lens while I was racking focus to make the light trails change in size. 

Get out there and give it a try!

Best,

Thomas

New Jersey’s Best Wedding Photographers