Props to you for giving it a try.
I'm making my first batch later on in the week and i've been trying to do alot of research.

Alot of my friends tell me that when you get your nuggs that your going to let simmer with the butter you should DUST THE SHIT out of your weed. Like stick it in the buster on high for 5 minutes straight, powder that shit.

Simmer on low with the butter. Use as much butter as the box tells you. For the batch i'm making i'll get 17 servings, and the recipe calls for 1/4lb of butter.

1/4lb = 1 cup

From what I understand for a whole pound of butter you should use a Ounce of buds. (28g)

Since i'm only using a Quarter pound i'm going to use a Dime (14g). I think it's a bit overkill considering the bud is some superfine AAA shit I grew myself but I want to get lit of these brownies, and get my friends lit too.

2.5g isn't even worth it bro, what you could do is make 4 cracker sandwiches though.

Bust up your 2.5 and coat 4 crackers w/ fatty peanut butter or nutelle, spread the buds ontop of the nutella so u have four dusted cracker halves, put another halve ontop and u've got urself a litttle sammich. Throw that bitch in the oven @ 400 for like 15 minutes, watch till the crackers get brown, take em out, cool em off and eat em. If you got dank bud that 2.5grams should get u really high.