Alex,
Hi, you are up for some real excitement since this is your first year. You will surely catch the "Spring Turkey Fever".
As far as my biggest Tom, took my old spring scale to 25 1/2 pounds. Don't be too concerned about the turkey weight thing, have fun and enjoy an exciting hunt. Of the 25+ turkeys I've logged the weight on, came up with about a 21.5 pound average.
Keep all your spurs....they make a great necklace when strung on a piece of leather boot lace and will also be a reminder of many great hunts.
Good Luck!