Wanting to get my first card graded, questions

A little back story. My grandpa remarried in the early 90's and her daughters husband (her son-in-law) was a coach at Miami. He ended up giving me a full uncut preforated sheet of the 94 hurricanes Bumble Bee set that was signed by Warren Sapp. This also has the Dwayne Johnson card which is the one I want to have graded and possibly sell. Being a preforated card I see some people have them cut and some fold, fold, pull apart. Which is the better way to go? I will be honest, I am scared to death to do the fold and pull apart method, if that is the best way to go are there places that offer this service? The sheet itself is incredible and I can not see any flaws on the Dwayne Johnson card, no dents, scratches, etc. but like I said it is still in full sheet form. I am not saying it is a 10 but to my amateur eye the way it sits I can not find any flaws. It has been a safe queen...but mainly for the autographed Sapp, I don't think anybody saw "The Rock" coming. 2nd, that brings me to declared value. I have no idea where it should be and it seems with this card it can be all over the place depending on the grade. What service level should I be using? Any thoughts or help is greatly appreciated.