Did you have the razor honed? Dovo's are typically not shave ready out of the box. Shaving with a dull razor won't get the hair off, and can irritate your skin.

Keep an eye on your blade angle, you want to stay just about at 30 degrees. Going at a larger angle will irritate your skin, and less will cause pulling.

Try not to go over the same place too often. The repeated passes will cause increasing irritation. I don't hit any one spot more than twice in one pass (if even twice), and usually two or three passes max.

Are you using any sort of aftershave? I use a soothing balm, and that helped me a bunch. It could also be the soap, have you used it before without problems?

As you can see, there are a number of factors. It could be one, it could be all. Try to eliminate variables, and you should be able to eliminate your problems.