Are you prone to catching edges? Detuning from contact point to the tip and tail respectively will help, and you won't lost anything significant in the process. Don't need anything special, just a file to take all edge off from that point outward.
If your talking about tuning the edge on the rest of the board, NS has historically used 90 on all boards. I have had edge grinds done on a couple of different ns boards, from 90 to 89, because that's what the shops machine was set at. Really didn't notice any difference. Theoretically it should make the board less prone to edge catches going with lower angles. My understanding is that it doesn't take much to make or break how a board carves. If you want to change it, I wouldn't go more than 1 degree at a time.
Also, ride it like it is first. You will likely find it's just peachy as is.
Btw, most shops can do an edge grind in about a minute, charge $10, and it will probably be more accurate than a hand held tool. I'd rather spend the $10 than spend the 2 hours hand grinding...